What happens is a terrible sequel/reboot/remake comes out, and instead of just admitting it was bad, one of the copes is to tear down the original. "Well, the original one wasn't good in the first place anyway!"
Thing is, if it really did suck, you wouldn't have tried to reboot it or whatever. Ain't nobody making a Back in Action Part 2.
Space Jam is a fun kid's movie. Hating on it because Space Jam 2 was a stinker won't change the fact that Space Jam 2 wasn't good.