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I think the difference is though, that while you and your friends disagree sometimes, you can still have civil conversations and healthy dialogues. My best friend and I for example, we agree on almost nothing, but that doesn't get in the way of our friendship because we have an honest respect for each other's opinions. With trolls, it's a different story. They often choose belligerence for the sake of belligerence and when you discover that they're not there to be reasonable, sooner or later you have to decide how far you really want to go to work with them.