It happens everywhere, but I've definitely run into it numerous times on Reddit. You definitely run into people who mistake emotional feel good head canon type thoughts as logical. I especially hate hypothetical hijacking where they show they weren't paying attention to your analogy and flip it on its head to prove you wrong.

I remember a while ago I was on an Elden Ring subreddit and I got shit on for saying a theory about the story that sounded nice and cool had no evidence. I got told I had to provide evidence for that claim, and I said I couldn't because I can't supply evidence I don't believe to exist. But the burden of proof kept getting put on me. I tried explaining that Occam's Razor applies here, if no one is providing proof then the simple answer is this whole thing is untrue. Then I got told actually Occam's Razor shaves off my argument because chosing not to believe in a theory makes more logical steps and is not the simplest answer.