I asked this question about an hour ago, which was promptly answered.
Even after an answer was posted and accepted, a user continues to troll me in the comments. I looked up this user, who has low rep and may therefore be sincerely asking questions to learn about the community.
My question is a little more general - if I detect what I think is the starting of a flame war, what should I do? I know that insults, etc are not tolerated by the SO community and should be flagged as "not welcome here", but how should I respond to a troll (and please correct me if I'm overreacting here)?