It's easy, someone shares with you a product of their hard work, for free, and if you then choose not to use it that's entirely fine. If however you choose to snipe at hard work, you deservedly attract criticism in the strongest terms.
A much more constructive response which would attract high praise could be any of:
A) learn how to and then fix it yourself, share this improvement freely with others B) sponsor someone to fix it for you C) engage in directed discussion with those currently in a position to assist but unaware of the issue - open a bug ticket