Fix yourself.
Phrases like this or "stop being a weirdo" are aggressive, insulting, and only work for you to feel superior to the OP.
Even something like "you have a lot of unsolved issues, you should see a therapist before attempting to befriend your ex", though equally blunt, is less deliberately insulting.
So for instance if a neurodivergent or non-social person acts in a way you disapprove, it's OK to bully them, according to you? Just so we're clear.