It's almost as if posting condescending explanations that don't track the discussion while smugly framing it as if you're correcting some misapprehension of the person you're interacting with is something that can be obnoxious.

It's okay if you're still confused. The world is tricky. Not everyone is equipped to reason about everything they encounter, even they see other people are, and that's okay if you can't. But if you're going to offer your interpretation you need to actually look into what the other person is arguing—not just make assumptions.