When I go to a restaurant and order a steak, and it arrives and tastes awful, the waiter does not have the right to say to me "if you don't like it, cook it yourself". The chef does not have the right to say to me "tell me exactly what I did wrong, since you're claiming you're an expert on steaks".

No. Anyone can complain about a thing, and the fact that they haven't tried to fix the code themselves is utterly irrelevant.