• Jerry going and telling the “stupid immigrant” in front of his apartment what to do with his life, and the guy obviously listens because he’s a stupid immigrant who has no clue what he’s doing with his life
• Jokes about Kramer being assaulted by a pedo as a kid
• Gaslighting in most of the relationships of the men
• Main characters drugging people secretly
• Various sexual assault jokes

And a lot of other things that I’m too lazy to list

1. The over repetition of lines is offensive to comedy.
2. The “not that there’s anything wrong with that” episode.

It’s not that bad for shows of that era though.