What an utter nonsense. Look at those threads. Look at reasons why those threads are closed. It has nothing to do with censoring. You're free to express all opinions you have, negative or not. Everyone is. But not when people start to insult other posters.
If they were really going to censor opinions, they simply remove the threads. I participated in many of those closed threads, they devolved into insult matches and attacking other people personally. That is why they were closed.