Early in my programming career, I got a whiteboard question where, after being asked my hobbies, I was asked to diagram an electric guitar on the whiteboard. I don't know that it was a particularly good question. But all this sabre-rattling against the whiteboard in general just seems like a silly distillation of a legitimate critique down to its stupidest form.

Even when it comes to CS algorithms questions. Yeah, asking someone to whiteboard quicksort might be bad, might optimize for the wrong things for the actual job.

But should it be a red flag that someone expected me to be able to do a more basic operation, that I've more or less purported to do professionally and efficiently, on a whiteboard on the spot?

[Edit: At my company we don't really do whiteboarding. We pre-screen with a time-limited open-book, open-internet test in advance. This helps account for candidates knowing how to quickly read/research/apply openly available information.]