So let's go from the fact that the word "Paki" is considered racist - just like the N-word for example - then I still don't see why a ban like this was necessary.

I find it kind of silly from you, Banana, to make such a comment on TeamSpeak (and I do believe Para is correct to say that you were loopholing) but a ban wasn't needed. A simple talking to or a kick from the server woul have sufficed, especially if nobody in the channel had any major issues with you saying it.