This is becoming more and more common. A troll, to me, is someone whose sole goal is to be deliberately goady or inflammatory in order to upset a poster or derail a thread. Not someone who says, 'actually Marjory I don't necessarily think that's true'.
It seems that as soon as someone posts an alternative viewpoint, they are immediately being labelled a troll. It's a bit tiresome and stifling debate in some cases.