To show you I'm not so bad here's a link that may be of interest to you:
It lists the reasons an account can be banned and includes a section on offensive IDs. What's offensive? Only Sony can decide.
Personally I hate censorship. They're just words. You don't have to let them bother you and they aren't harming anyone. Try to open your mind a little and not be so uptight. Also MW2 is the most mainstream game out there, so a huge number of immature kids is to be expected.