It is not the subject that is rude, it is your way of presenting it. If you talk down to people, who are genuinely confused, you appear as a jerk, and will get a negative response. Maybe they could have looked it up, yes, but people also want to interact with each other on a discussion platform, which is one reason making them rather ask, what is going on. If you do not want to interact with them - just do not. Other people will usually answer the questions.
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