Narcissism to varying degrees. I think most people are a little full of themselves.

They leave you emotionally and physically drained out.

Low self esteem

They don't love me. That's so rude!

having no personality aside from their "dark sense of humor" which is literally just casual racism, homophobia, misogyny, etc.

They 'sit on the fence' about many things that actually matter, and have comically strong opinions about things that really shouldn't.

Overly competitive/self-promoting, self-centered behavior. Overly focused on the self.

Negativity/judgementalism

Inconsistency

I am lucky to report that the people here have basically no common negative traits. Diversity, yay! LOL