As it isn't our server our the vote is academic really. Whilst the phrase used may be suitable and acceptable amongst friends and closed groups like your friends, in many countries and groups it is considered a very offensive and racist name regardless of context. The same goes for other colloquial terms for races or people from any country, gender, sexual orientation and so on. That may seem politically correct but that doesn't make it any less right. When playing online we have no idea who we are playing with, their race gender and so on so we need to be sensitive to what we type. It doesn't mean that you can't have fun just have some respect for others and how it reflects on yourself.