salty mud
Deity
There's a lot more than mere disagreement involved. There are some people who simply can't ever discuss things civily here, on both sides of the political spectrum. If a poster injects violent fantasies into his posts, am I being "arrogant and rude" for refusing to put up with it and putting him on ignore?
The correct and adult thing to do, if someone does somehow manage to make you so amazingly upset on an internet forum, is to close the tab and go elsewhere and not let it ruin your day. The wrong thing to do is whine and complain about it in a different thread, acting as if you are above other people who post here.