I try not to say anything on a forum that I wouldn't say in person, because I'd rather just be 'me' when I'm talking to people. I don't trash talk to people in games either. But I don't see ganking as abusive or nasty at all. Killing other players irrespective of character level is just part of the fun and is the reason why PvP servers exist. If people don't like it when someone kills their character they shouldn't play on a PvP server. I play on PvE servers these days because life is easier when you're trying to get quests done.
I used to play Dark Souls quite a lot, and the PvP community in that game had a whole thing about 'honour' and what was considered acceptable during fights. I took a 'I will do whatever I can to ensure that I live and you die' approach, which earned me a few irate messages I just found it amusing more than anything else.