Hardly comes as a surprise to see this kind of behavior, Garry's Mod has always been a safe haven of sorts for children who don't understand social norms and who just the same grow up to be abusive idiots who like nothing more than to cause trouble and drama for no other reason than to make people feel bad. Best thing to do is to just ban them and respond to their idiocy with sarcasm as half of them can't handle it and fall into a fetal position before crying themselves to sleep on the floor.