Tbf, a threat of violence is only one way to read his response (I know nothing about this Paul dude and his personality, so maybe it was 100% a threat idk).

I could also see his comment as meaning “just because you’re behind a computer screen doesn’t mean you should feel able to say shit that you’d never say to a person’s face”, because let’s be honest, that’s a reminder a lot of folks on the internet could use, regardless of who could kick whose ass