I agree, but here the topic is simple question being considered unfair, because someone might be too stressed. I would argue that asking questions is not unfair level of stressing people.

It's not simply a matter of "asking questions". It's about getting asked (often gratuitously difficult)† in an intrinsically awkward and confrontational situation -- quite often by someone who not only might not have adequate social skills for the task; there's a good change they may not really know why they're asking that question of you in the first place.

"I dunno - they put me through this stuff, or some variant, on my way in. So now I guess it's my turn to dish it out on the people trying to climb in after me" seems to be about the order of reasoning in place behind these "methods".

† As in, was an open problem in the literature and/or folklore for years before some (now) highly respected came up with the first reasonably adequate (but like as not, overcomplicated and/out outright flawed, at the outset) solution. We know the "usual suspects" that get asked -- I don't need to list them here. But ff you genuinely think that any candidate you can (reasonably) expect to find in response to your muddled job postings will genuinely be able to solve these problems for you at the whiteboard for you -- from the void, as it were -- as opposed to regurgitate carefully practiced solutions they found from cobbling together lists of "problems Google and FB like to ask" -- you're seriously kidding yourself.

This thread is about calendar question - figure out whether two appointments overlap. That was not open problem for years and you should not need to memorize solution to solve it.

There is nothing to suggest that parent poster has bad social skills or that his job posting was muddled.