The peculiarities of the English language! Some one with asthma is asthmatIC, someone with anaemia is anaemIC, someone with dyslexia is dyslexIC, someone with autism is autistIC, someone with schizophrenia is schizophrenIC, and so on. However some one who is athletic is an athlETE, someone who is..... nah can’t think of another ‘ete’ example. As I say the peculiarities of the English language. Whether you’re a diabetic or someone with diabetes is another discussion, personally I don’t mind being either.
Edited for typos.