The definition of trolling and flaming here can vary because there are some exceptionally thin skins here and some exceptionally thick ones.

If name calling, insulting or a condescending tone is involved, if the person is criticised instead of the idea. I would term it a flame unless, a **bg** or :) symbol is used to indicate humour.

Trolling is more difficult, I've know folks who were simply expressing their honest opinion without insult who were accused of trolling. Is someone posts a controversial statement and fails to respond reasonably to the subsequent posts then there is probably a troll under your bridge. But by then who cares? If the conversation interests you ignore the troll and talk with the others. If it doesn't interest you move to another thread. The one thing not to do is to whine about others who have responded. That is the troll's favourite food.