That doesn't preclude their point from being true.

Why not just apologize and have Claude rewrite any code that's similar? Whether you did it intentionally or not, you probably agree that you can't keep using his code and that it would pretty bad if someone did something similar to you.

"Nah"?

I suspect we're dealing with a child here with a cloud code subscription who isn't quite familiar with US copyright law or software licenses yet.

You’re an absolute loser.