At some point I came to the conclusion that the best reaction I could have to being downvoted was to take it as editorial criticism on my writing. This means just assuming that I didn't make my point clearly or that I was mistaken or didn't use the right approach to the reader. When I am downvoted, I tend to edit my comments. Sometimes this means changing the words around.

And sometimes it means deleting the comment. Not because I'm afraid of being banned, but because it's not very good. I've found that deleting not very good comments is good practice. That just saying the stupid thing that I feel compelled to say is enough. I don't need someone to actually read it. I'd rather have people read my occasional good comment.

On the flip side. Sometimes I downvote a comment in lieu of arguing. Actually, it's probably a lot more often than sometimes. Those downvotes are in lieu of mostly unproductive xkcd386 "someone is wrong on the internet" comments I might write if downvoting and moving on wasn't an option.

There are things about which it is reasonable to disagree. For example I believe that discussion is more productive than debate and that conversation is far more productive than either because it doesn't require opposing viewpoints as a starting point and doesn't entail the idea of winning or scoring points.

There are plenty of other places I could do that.