He's partially running an Appeal to Ignorance fallacy. Just because you can't disprove something doesn't mean its proven.
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Yeah, ugh, it's just like the most annoying thing ever. I don't normally get in arguments, but when I do, I HAVE TO WIN. Like, I'll accept if I'm wrong, but I only will involve myself in an argument if I know I'm right. So when I got into this, I was getting pretty angry at the end.