> "What does this tell you?"
Why didn't you answer, that it tells you that his camera is unfocused?
I don't understand how people tolerate this for so long, I'd start trolling the guy after his third question. If he wants to be rude, then I'd retaliate and make sure I have a laugh while he is wasting his time.
Hard to claim the moral high ground if you do eye for an eye. Always be nicer than the other side.
Even for practical reasons. If they think you are a prick, the blast radius can be substantially wider than this specific interview. And for what? The lulz?
I'm not saying to accept rude behavior, but one can leave such situations without being rude back or making a scene.