I didn't realize it then, and I'm embarrassed about having condoned this behavior by feeding the fire.
Are there any hard and fast heuristics that you use to identify trolls? I can diagnose the patently obviously cases, but apparently I can't see the items that are subtly trollish.
(As a side note, I've found I have the same deficiency across all the sites I frequent).
edit: My motivation for asking is this: I like and respect the people here. I do not want to make the same mistake as last time. As far as I can tell, the definition of a troll is heavily dependent on the community that defines it.