So pretty much TL;DR is that it all depends how you use the word, if someone is offended by it, and staff discretion.
Yes. It is simple. Saying it to intentionally target a player? Don't say it. Someone is offended by it? Don't say it. IMO I don't have a problem with the word as long as it is not meant to intentionally hurt someone. But if you have to ask yourself if something is appropriate before you say it, you probably shouldn't.
This question seems answered to me, a staff member can lock it now if you'd like. Seems like it pretty much just comes down to context.