Oof. Been there, done that.

In my opinion, a major facet of maturity is figuring out that all the negative shit you think about other people is often just the things you don't like about yourself projected onto other people.

Everyone generalizes from a sample size of one.

Well, at least I do.

Precisely. He likely had a revelation about himself, and writes about it with the language, "people are mostly xyz." What a joke.