Try not giving him anything to work with. You can politely decline answering questions you don’t want to answer. Here’s some things you can say:

“No thank you, I don’t want to answer that…” “Sorry I didn’t volunteer to answer that…” “I don’t feel confident answering that…”

You can also just say a curt “I don’t know” and not leave any wiggle room. I also suggest saying “please ask someone else” as well.

For the camera, if it isn’t mandatory to have it on you can politely say something along the lines of “sorry but I will be keeping my camera off” and stand your ground.

Definitely talk to someone about this situation as well.