I've posted a few AIBUs under another name. Sometimes it turns out I am being unreasonable. Which is good to know, after all it's why I asked the question.
Some people manage to communicate this very constructively, encouraging you to see it from the other person's perspective, sharing personal experience etc.
However some replies basically seem to take joy in tearing you down, being consescending/dismissive, not really adding anything to the discussion other than how ridiculous they think you are.
AIBU to think that if you disagree with someone, there's always still a respectful way to communicate that?