I don't think there is much to worry about. The only time boxing seems to have really upset a GM is if your causing disruptive behavior. IE near a quest turn in and sitting there for hours on hour taking out random players.
For collecting nodes there isn't anything wrong with farming to your hearts content as long as they don't think your botting it, and it's really easy to see a bot vs a real player interacting. Some of our characters will miss a node, and we'll have to reclick that char, while a botting group literally perfects it every time and they usually run on their own and not in follow from what I have seen in the wild.

I've had my fair share of upsetting other players in the pvp context and I'm sure others have as well and there is no harm in it. Just move on and don't camp. Even if you skirmish with someone twice or three times that's still within normal range. I'd say 10+ or so it's excessive.