To get people to stop saying my old friend when someone kills them in a videogame, would require censoring chat in such a way that I think would be a huge turn off for the majority of players.. but this comes up to the ethical questions of putting the majority ahead of a minority.
In my eyes, it would turn it into a "Christian Gaming Server" where people are afraid to use chat or play on at all for fun due to admins having leeway to ban for saying "fuck" or something like that in a game where you kill people over and over and has an ESRB rating of "T" including a note for 'Mild Language"
Now when it comes to individual harassment, that is a whole 'nother ballpark and no admin will tolerate that, we strongly recommend you report in "i" chat, document with screenshots of logs and post in the ban request section and they will be handled appropriately.
What you will notice is that most people's opinions here will be "shut the fuck up pussy" and we've had threads about this before that devolve very quickly.. its actually a pretty interesting topic to me, and we as admins do try to create an environment of fun on the servers where anyone can be welcome to play so I welcome the talk.. just don't expect to get most players to stop saying "that shit is gay" anytime soon