I’m sick of people posting vague one-sentence questions and then complaining when they don’t get the response they want. They should feel lucky that people are willing to put so much more effort into answering their questions (not to mention trying to guess what the hell they’re talking about) than they put into asking them.
Please note, I’m not talking about questions that genuinely only require one sentence for their meaning to be clear. I mean things like “How does anything exist?” Especially if the poster then has the gall to start bitching that the replies were “non-responsive.”