What Your Iced Coffee Is Telling Your Interviewer

A viral hiring debate is really a lesson in signaling theory, and why the signal depends on who's reading it.

Sep 28, 2026

The internet is fighting about coffee again. This time, a veteran recruiter posted a TikTok criticizing Gen Z candidates who show up to interviews holding iced coffee. She argued the drink makes the interview look like just another stop on a list of errands.

The video took off across TikTok and LinkedIn, and thousands of recruiters, career coaches, and job seekers weighed in. They were sharply split on whether a cold brew is unprofessional or completely harmless.

One side says professional settings come with expectations, whether you like them or not. The other says judging a candidate by their drink says more about the employer than the applicant. Here’s the funny part: both sides are arguing about the same economic idea. They just don’t realize it.

What Interviewers Actually Know About You

Before we judge the coffee, let’s ask why companies make you interview at all. The short answer is that they’re guessing. An employer wants to know whether you’re reliable, sharp, and serious about the job. Asking you directly doesn’t help much, because every candidate says yes, including the ones who shouldn’t. Economists call this information asymmetry. You know whether you’re a hard worker, but the interviewer may have to wait months to find out.

An employer will work hard to close that gap when a bad choice is expensive. For a part-time retail job, a half-hour conversation is probably enough. Training is quick, and a bad hire is easy to replace. But a salaried job for a new grad? A company may spend months training you, which makes it a much bigger bet. That’s why fresh graduates go through recruiter screens, skills tests, and several rounds of interviews before getting an offer. GenAI has made it easier to apply for jobs, so employers are adding more hurdles to narrow the pool. Heck, just sticking with the process through multiple rounds shows how much you want the job.

Whether the interview lasts thirty minutes or a full day, the interviewer is doing the same thing: filling in what they can’t see with assumptions based on what they can. Your résumé, your handshake, your outfit, and how you handle a question you didn’t expect all get treated as evidence of something deeper. It turns out that economists have a name for that kind of evidence.

The Economics of Signals

Let’s meet our economist, Michael Spence. He shared the 2001 Nobel Prize for explaining how job markets deal with information asymmetry using signals. Employers can’t see the traits they deeply care about, so they have to infer them based on what workers do show them.

There’s a catch, though. Signals are really informative whenever they are costly to fake. If anyone could send it for free, it wouldn’t tell an employer anything.

A college degree is a classic example. Yes, you learn real skills in college, but a degree can still be valuable even if you didn’t learn anything. Getting through four years of deadlines is hard unless you’re persistent and conscientious. The diploma separates people who have those traits from people who don’t. You can see this best exemplified by a phenomenon known as the “sheepskin effect.” The year you graduate raises your earnings more than the year before it, even though you don’t learn all that much more in your senior year compared to your junior year.

You can see other signals all over the workplace once you start looking. A wedding ring is relatively cheap, but the commitment it represents isn’t. Of course, the signal it sends may differ if it’s coming from a man rather than from a woman. The way you dress also sends a signal. A sharp suit tells an interviewer you know the professional norms and took the trouble to follow them.

But what about the iced coffee?

When Signals Break Down

Wearing a suit in an office setting or for a professional interview works as a signal because almost everyone in those contexts agrees on what it means. The iced coffee fight is really a disagreement about what the signal means, and the answer depends on who you ask.

To a lot of older Millennial and Gen X hiring managers, the coffee is a red flag. The critics usually argue that your iced coffee shows one of two things: either you don’t know the norm, or you know it and don’t care. In a formal interview, neither looks great.

To a lot of Gen Z candidates, it’s just coffee. They aren’t saying professionalism doesn’t matter. They’re saying a latte doesn’t measure it. Leaving the coffee in the car costs a brilliant candidate exactly as much as a mediocre one, so it can’t help an employer tell them apart. But it might show whether someone taught you this particular unwritten rule.

Part of the gap may simply be habit. Americans under 30 were more than twice as likely as those 65 and older to say they love iced coffee.

A signal that means different things to the sender and the receiver is a poor signal. Unfortunately for Gen Z, the ones interpreting the signal are the ones running the interview. It doesn’t help that recent grads are facing one of the toughest entry-level job markets in decades. Employers have plenty of applicants and little reason to question their assumptions. That’s why even people who think the rule is silly still tell candidates to leave the drink behind.

But norms aren’t laws of physics. They last because most people follow them, and they fade once enough people stop. A suit used to be the standard outfit in almost every office job. Then business casual spread, and in plenty of offices today, a full suit can look like you’re trying too hard. The signal hasn’t disappeared, but its meaning has changed.

The same thing will probably happen with interview etiquette. After all, Gen Z is a growing share of the workforce and is already moving into management. As they take over the interviewer’s chair, the coffee rule will likely loosen. Those of us in charge of hiring right now can complain all we want, but we’re probably the ones who’ll have to adjust.

Final Thoughts

So should you bring it or not? Signaling theory won’t give you an answer, but it gives you the insight to ask what the signal says and who’s reading it.

At a startup or creative agency, the norm may already have shifted. In that context, showing that you understand your surroundings could be exactly what the employer wants to see.

But in a buttoned-up Fortune 500 interview, the old norm is probably still strong enough that breaking it sends the wrong message. Finishing your drink in the parking lot costs you five minutes. Bringing it inside could cost you the job. No one knows when the norm will fully change, but until it does, leave it in the car.

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