You just met "proof beggar", that's all. "Proof beggars" are kind of trolls, they never provide any proofs by themselves, think that proof is just some expert statement, and never will accept any proof you provide. Even if something extremely easy to check, they will never check it by themselves. They don't need to, it's not their goal. They want just eat your time for nothing and that's all.

There also exist complete opposite of "proof beggars" - they will pretend that some idiocy is a total proof of something they believe, and can't be argued against for reasons. Nothing could shake their conviction at all.

Both types have one thing in common - they never want to know how things really works or at least try to understand thing they argue about, instead they always just blindly believe in something somebody else told them or something they read, heard or watch somewhere once. None of them ever made their own conclusion on any matter, they always consume someone else bullshit.