There's a famous anecdote about Samuel Johnson. It's said that he was so irritated by a mention of George Berkeley's assertion that there is no reality except for what is perceived that he kicked a rock and said, "Thus I refute Berkeley."
What's the problem with arguing on the internet? Some people think it's that no one respects experts anymore and that leads them to spread misinformation. But in truth, most experts are fatuous idiots and liars, and it's actively a good thing that people ignore them.
A more serious problem is that there's no way to appeal to objective reality. You're not face to face with anyone. You're not sharing space with them. Cyberspace isn't space. So you do see people assert some things and deny other things in a way that would entirely collapse if they weren't alone with their reflections.
