This is one of the things which really rubs me the wrong way. I've rejected a couple of offers over the years simply because the interviewers came off as weird

This is one of the things which really rubs me the wrong way. I've rejected a couple of offers over the years simply because the interviewers came off as weird robots with poles up their asses (that unfortunately includes Google, where the people I met couldn't take a joke but had no problem laughing about others). You CAN crack a joke without being unprofessional, especially if it's about the profession. I don't understand why people choose not to do that. Humor is one hell of a stress coping mechanism and inside jokes are a side effect of having a cohesive team.