I have every reason to believe I should be diagnosed with Asperger's, but I'm not. I almost got diagnosed with it, once, but then the psychiatrist really suddenly changed her mind and never explained why. Probably because I withhold many truths from them that are unsafe to say - I don't want to risk getting locked up somewhere, and then even risk getting forced ECT "treatments" that would cause my memory to very possibly be permanently messed up and with blank spaces in my memory for events all over in my life. As such, I very likely may never get this diagnosis, depending on how dumb the people who would decide would be - in my case, withholding information should still be enough to get a diagnosis, but psychiatrists do seem to tend to see things in black and white about Asperger's, as with many other things, so very likely they'd think it isn't "enough". So asking a thing like that may very possibly be pointless - a diagnosis is only given from psychiatrists that well may be unaware of what one really thinks and how one really acts. Unless, of course, it can be determined with brain scans? However, no, it wouldn't really be rude in my view, but I'd explain what I just said, in such a case, and hope that whoever asks realizes that it isn't necessarily a very meaningful question to ask.