Same happened to me. I was deeply involved in the local improv community for a few years, and it was great at first, but a few toxic people drove me away for good.

My theory is it is a gathering place for people with narcissistic traits -- I mean, part of the appeal is being the center of attention and having everyone think you're brilliant and hilarious.

(Again, though, we all have narcissistic traits, but few of us are actually full-on narcissists.)