I immediately downvote them. It doesn't matter if I agree with the subject at hand. I just find it incredibly annoying when people play the victim complex in order to try and get their point across, like they're some rebellious bad ass who is so above everyone else that they know what's right and you don't.
Similarly, the truly unpopular opinions either see no traction or get downvoted into oblivion (like my recent singed post stating he is op, which he is).
For those of you that have done this or are thinking about it: **stop**. You're like those youtube comments saying, "who's listening in 2k17," Or, "hehe I'm 12, like Pink Floyd, rawwrrrr xd."