More moderation (sucks, I know :(). I've seen enough communities to know you cant really code round this sort of thing.
On the other hand I do think there are a minority of people using this more aggressive tone (or rather are causing it to spread). So that makes it a little easier to deal with - having a jerk flag is a good idea, then you could start to limit the site for those with a high jerk rating (i.e. longer cool off times for them, delays between their comments, when they submit a comment it asks them "are you sure you want to post this hinthint"
On the other hand I do think there are a minority of people using this more aggressive tone (or rather are causing it to spread). So that makes it a little easier to deal with - having a jerk flag is a good idea, then you could start to limit the site for those with a high jerk rating (i.e. longer cool off times for them, delays between their comments, when they submit a comment it asks them "are you sure you want to post this hint hint"