Abuse is abuse, and trolling is trolling, no matter to what extent the objects deserve criticism. This is how I understand Joe's message, not as a statement about the content of any such dispute.

Civilized persons who wish to counteract propaganda have the following options:

1. ignore it ostentatiously, for example by continuing the previous discussion of the thread or giving the thread a new turn within its topic
2. state their disagreement briefly in sober words, and no more than once per thread
3. point out the propagandist's fallacies in sober words, and no more than once per thread
4. point out the propagandist's lack of civilized behaviour (in case s/he pretends otherwise) in sober words, and no more than once per thread

Option 1. is most efficient.