I help with several forums and yes, sometimes my answers can be a bit rude but there is usually a reason. Those asking questions don't realized that we are not sitting in front of their computers, we do not have the immediate magic fix, we actually need the user input to help us to help them. sometimes it is extremely hard not to tell the person to pack up their computer and send it back because they are too stupid to own one. It gets frustrating when the user will not answer all the questions asked about their computer or they refused to try some of the fixes for whatever reason, what makes it worse is when they are also getting help from several other forums resulting in wasting time where others could be help or conflicts because we dont know about the other possible fix being tried.
too many times questions could be answered a whole lot faster using google than waiting for someone to respond to your tech question. some forums are strictly moderated but they will allow some of what you may consider unhelpful comments because without seeing those comments, were they really unhelpful, possible solutions that did not work or did you not understand what they were asking of you?