It makes sense to talk that way to your friends, because you're already friends and there are stronger bonds holding you together. That makes shredding each other fun, because everyone knows it's in jest.

A large semi-anonymous internet forum like HN is at the opposite extreme. We're almost all strangers and near-strangers. The community has low cohesion, so the same behavior, with the same good intention, does harm.

You know how rugby players are famous for beating the shit out of each other on the pitch, then going out drinking after the game? I always envied those guys that experience. It works because they have high cohesion. They also know not to walk up to a stranger, smack them onto the pavement, and expect to be bought a beer later. You need to adjust for context.