Would you be friends with someone who didn't have a good sense of humor?

I am friends with many like that.   I just make fun of them of course.

Probably not, especially those that have no ability to laugh at themselves.

Sure. It would be a bit challenging, but I try not to exclude friendship opportunities because of small differences.

Possible but difficult .. I'm always more at ease with those who don't take themselves too seriously, those who can laugh at themselves

yeah, and i have been. it's easier than being a witty conversationalist, but it's not a lot of fun.