You have a right to complain about anything and everything.

For instance, I don't pay a penny for HN but I can complain that these discussions sometimes become self-congratulatory prattle where angry people carrying a giant chip on their shoulder posit absurd, completely ridiculous notions and they're supported in their group delusion by like-minded parrots. You don't have to agree with my complaint, but nor do I need your or anyone else's permission to hold it.