Well, there are lots of rude questions.
There are the ones (as exemplified above) that assume negative aspects of your person or character and question why you are such-and-such a way—assuming that you are, or assuming that that’s a bad way to be.
There are overly inquisitive personal questions that are rude—for which different people have different thresholds of “rudeness”—such as income, sexual orientation, age, weight, etc.
There are also overly abrupt and (apparently) short-tempered questions, such as “So what?” in response to a comment or complaint. “What are you lookin’ at?” is a rude question, often in response to a rude or overly inquisitive look or stare.
Hell, even a question that isn’t properly understood or heard can be “considered” to be a rude question, whether it was really intended that way or not.