Then they get fired, normally after being counselled. They don't get told they are so worthless they should have been aborted.

I wasn't aware FOSS projects were compelled to accept code contributions...

The point is that this situation wouldn't exist in a workplace. So talking about what conduct is tolerated there... doesn't really apply.

Okay, fine, remove workplace if you want to quibble about semantics and broaden it to "Most human interactions". Most human interactions consider a modicum of respect for the other party to be a basic requirement.