I generally turn to Aesop’s fables for guidance and he wrote a dozy on criticism about an old man and his son bringing a donkey to market. Let me quote the story:
I don't have to give the punch line here; the obvious moral of the story. Criticism is constructive and can be helpful. Criticism is an off shoot of free speech. Criticism without a suggestion - with just observations - is backyard, over the fence, bitching and moaning. It contribute nothing to the solution.
Put up or shut up.