Here's the difference, you're not putting any context on it. There's no delivery, just a vague 'thought provoking video' comment. The difference between someone who wants to spark a lively discussion versus someone who is trolling can be very fine.
If you prefaced it with (and were honest):
"This video makes some really good points about the 9/11 attacks. After watching it, I'm thinking we were lied to and there's a conspiracy to cover it up" or "Look at the latest crackpot video, it's pretty nutty"
...then you wouldn't be in this boat. One of the roots for the term 'trolling' is the physical act of dropping a hook into the water, then driving around in your boat waiting to see who 'takes the hook'. There's a direct correlation between your thread starting post and that phenomena because you haven't provided the active structure I mention above.
The next questions I'd have to figure out are: "Is he naive and doesn't understand the difference or are his continued responses part of the troll?" I'm not deciding on that last one yet, I'll give you the benefit of the doubt, but you should understand that others won't. Keep in mind, more then one person has suggested you're trolling. If you're the only one who thinks he isn't, that might be something to think about.
PS, inadvertent trolling is very possible.
