Having a different opinion and arguing to that opinion is generally fine. Comparing opposite opinions is also fine. What typically makes it trolling is attacking the other person or group of people instead of debating the position.
Anyone who thinks __________ is stupid -- trolling.
I don't think __________ is a well thought out opinion -- debate, unless it goes on to question the opponent's education/intelligence.
If you look more closely the evidence says __________ is not supported by the facts. -- better debate
If you have counter examples, feel free to ask about them -- in PM if it involves a mod action.