Downvoting isn't even an actual thing here. It just marks the comment for you red, but it doesn't change the number of upvotes. (Which brings people to actually comment and explain in which way they disagree, instead off just putting someone down with a single click)
But technial stuff aside:
Even here on tapas, some people have questionable opinions on some topics. Which is to be expected. But in most cases, you can actually discuss stuff with them. But yeah, there are barely any hate messages, trolls, or anything of that magnitude. In all these years on tapas I've seen one or two trolls and they got banned rather quickly.
All in all, tapastic is a save heaven.
(Beware of the shippers, though ^^ )