I find this post accurate. Please also keep in mind that interviewing is as much about deciding if the company is right for you as it is if you are right for the company. When I take a bit too long to solve the coding challenge and the interviewer puts on an attitude I just assume that this is what it would be like working with this person, no thanks.

I recently interviewed with a hot VC funded start-up, the interviewer was the most dry and passive aggressive person I have ever met, I decided about 5 minutes into the 'get to know you, tell me about your work history' section of the conversation that I would not like working for this person. I had never wanted to end an interview early before this experience. When they sent me a leetcode link (to a problem I had solved in preparation for a series of interviews I was doing) and asked me to solve the problem I just sat there wondering how long before they would ask me to leave if I typed nothing. About 5 minutes later they asked me to leave, and that was the first time during the entire interview that the interviewer cracked a smile. I think that company will fail.

Am I the a-hole for playing that sort of game?

Edit: I also interviewed with a medical startup during which the interviewer, while telling me it took me a while to get to the solution and critiquing my implementation, admitted (I think by mistake) that they had spent some time researching the solution prior to the interview. I asked them how long it took them to solve, he did not answer that question.