Honestly, I see very little "debate" going on, and more, "your opinion is stupid and differs from mine, therefore you are stupid and must be destroyed".
Ultimately, on the dark side of things, that's where debates end up -- at war.
I think its easier for people to debate in small groups... once it gets larger, and more fuel is added, it becomes simpler to just make grand statements one way or the other. The 'negative' group is no better than the 'positive' group when it comes to putting down the other side.
In fact, I see the negative people usually attacking just the film, where as its the positive group that starts attacking the other side directly with words like "haters".