To be fair, you’re describing several people who post here or used to post here. That’s why when you run into someone who you know is 100% wrong but they’re determined to die on their hill, just stop replying to them.
I’m not saying I agree or disagree with that user because I’ve agreed with them in the past, but some users will also do this to get others going. They may not believe what they’re saying in any way, shape, or form. They’re just hoping someone engages with them while they giggle to themselves.