You've touched upon an incredibly grey area. Most forums will ban trolls, but therein lies the problem: define "troll".

I don't know what you said, where, and in what context... but I don't give benefit of doubt on this. Nor do I think you're guilty either... all I do know is that running a community is hard, and one of the things that the people of the community look to moderators to do is to keep the peace.

A difference of opinion can be minor, or major. And depending on the topic it can be quite offensive to some.

Have you considered that within a particular subreddit that the moderators were just trying to keep the peace? Has anything stopped you from starting your own subreddit to voice your opinion?