Expect the best out of people and you will never be satisfied. Expect the worst out of people and you will never be disappointed.
People are the worst and an entitled little snowflake who's never been told no and never been told that they're wrong is going to react in this manner. Correcting rude behaviour on this site (or any other) is like handing out speeding tickets at the Indy 500 - absolutely futile and utterly pointless in the end. ¯\_(ツ)_/¯
The internet isn't a hug box. Not everyone is going to coddle you. Your issues are yours, and if you choose to complain about them then people are likely going to find them trivial. And nah, people don't deserve to be banned just for being blunt. Grow up. If you can't handle it, don't post.
Listen man. People are gonna be rude on the internet no matter what you do. It’s part of internet culture. Hell I informed the same user, but a good recommendation is just not give two shits. There gonna be an asshole and can either respond or not. Now if there going after then fight back, but don’t make a callout thread. Uhhhhhh then probably just don’t care afterwards.