If you really want to take distance, stop doing that. Let him be with his claims. Just ignore.
But to defend him (as I'm now being compared to him

), is he really shallow?
For me there's also a huge difference between assuming something in a discussion and actually believing it.
I'm incredibly critical of my beliefs and I actively seek to prove myself wrong. I can spend hours on the internet searching for arguments against my beliefs.
But I'll always assume and express what I believe to be true to that point. I'm quite convinced of most of my beliefs, because I checked them well.
Then I spray my beliefs and claims of truth, even if they're weak. The goal of this is that even more people can check them and teach me better beliefs. That way I can improve them.
If I never make claims or assumptions and I never share them, how can I ever find good ones?
I can't promise that he uses the same justification for spraying his claims around, maybe he's just a know-it-all who
isn't willing to change his beliefs.