It sounds like #C has chosen as its mission to teach people the C programming language. To that end, they see it as a derailment of their existential purpose to help people who "just want the trivial fix." To them, it's rather like going to a math tutor with your homework and saying "I don't want to know how to do it, I just want the answer." Correctly or incorrectly, they think that helping you in the way that you ask won't teach you anything, and that it will ultimately hurt you on the final.
Even among communities whose mission is to help people with specific questions, like StackOverflow, the folks answering questions still require a certain amount of buy-in: evidence that you've thought about the question enough to understand precisely what the problem is, and evidence that the problem doesn't have an easily found solution on Google. Without that buy-in, the social environment they've set up will inevitably devolve until it's really difficult to separate the genuine difficulties that can be solved from the white noise of people asking the same question over and over.
So while I wouldn't defend the people in #C wholesale, and there may be plenty of vitriol there, a refusal to help when someone just wants a quick answer doesn't sound unreasonable, and in fact may be all that holds their community together.