This is true of many kinds of people (e.g. New Yorkers, Parisiens, text editor/programming language aficionados, etc.) They complain about whatever it is they hold dear, but take umbrage when outsiders do so.

I hate to use a NNT-popularized phrase, but it's partly because outsiders don't have "skin in the game", and their complaints don't come from a place of shared adversity and knowledge, but from a place of unearned superiority and ignorance.

In most areas in life, you have to earn the right to complain.