This is much worse than trolling.Trolls never hurt anybody's sentiments.
It can; trolling is just a waste of time, especially on a forum like this. How could you expect to have a decent discussion with someone if trolls kept attacking you from every angle?
As far as the person quoted is concerned: Even though technically you are allowed to use offensive language and whatnot, cases in which the user is only being abusive and does not add anything to the discussion will be dealt with. This goes against the first two rules as listed in this section.