unrelated questions
I hate it when people ask me questions about things they have know reason to think I know more than they do about. For example which smart phone (that just came out) X or Y? How the heck should I know I'm not in the market for a new phone. You can do the same thing I do and look up the two phones and see how their features and cost compare.
Similarly, "oh your such a good programmer so you know tech. I'm trying to setup my kids keyboard into my TV's surround sound and I'm having some trouble." Really because I know computers I automatically am an A/V guy (especially with a musical bent)?
Otherwise though if the question is something that is reasonable to assume I'd know something about I'm okay about it. But I do get snarky when people ask questions about things that is their hobby not mine.