yeah, that's really the thing here. There is always going to be some idiot "misinterpreting" things. I really think the key is not to get fired up about, and not start a biggering match with the individual.
For example the youtube comments. One guy makes a stupid comment. And suddenly 12 people is down on his throat and the whole comment section is about whether or not the video is offensive. It would be much more helpful to ignore him, or at least only dignify him with one or two responses. Chances are he is trolling anyway.
Instead try to steer the conversation away from negativity.