TBH, I think it might be a combination of things going on in the world and just in general peoples cultures have shifted less to "respect thy neighbor" and more to "I do what I want."
At the end of the day, believe it or not the overall WoWs community is pretty friendly, more so than most, that being said, every game in existence has its toxic group. I try not to let it get to me, though I know that isn't easy.
-Hapa