Many Autistics have higher than average measured IQ, and many Autistics have measured IQ that falls right into the median, while still others have an intellectual or cognitive disability.Some Autistics have dyscalculia or similar learning disabilities, and actually find math to be extremely difficult.Among Autistics, there is a huge range in individual abilities, skills, needs, and challenges.
It's insulting because it suggests that because the person doesn't appear to be disabled or doesn't fit preconceptions of what Autistic people are supposed to sound or act like, that person must therefore not have a disability or be Autistic.
It's not about being politically correct or avoiding being offensive ...
it's about basic respect, and knowing that some questions are better off not asked, and other questions shouldn't be asked before you've even gotten a chance to know a person. 2012: After receiving a slice of humble pie over the anonymity of the internet for language that was interpreted as cissexist, binarist, and inaccurate, I've revised the language in number 13.
Other Autistics, including those who might be good at math, simply don't like it.
And yes, some Autistics happen to be excellent with math and enjoy working or studying in related fields.