I'll play devil's advocate here and say that not only the rude are encouraged by anonymity, but also people who make careless and irrational posts that sometimes draw the ire of the less-than-patient.
Basically 11 year old me, when I first joined GBAtemp. Didn't know how to use the site so I somehow managed to double post threads in USN asking what the best NDS flashcart was. Needless to say, I managed to incur the wrath of some people. I though I had done nothing wrong, but looking back on it now I was rather ignorant and cringe-y, to say the least. I could see why people would get annoyed when they have to deal with children on the internet.
I appreciate the more patient members and staff, as they welcomed and comforted me when I thought everyone hated me, and they're the reason why I'm still around on GBAtemp to this day.