First off, "fake news" doesn't mean what you're using it to mean here. Editorial, spin, distortion, or misinterpretation of real events to score political points is not "fake news". Deliberately making up complete fabrications out of whole cloth, knowing (on the part of the creator) that they are fake, and trying to get other people to believe it, is what "fake news" means.
Second, I'd like to see an example of Trump mocking an able-bodied person in the same way as he mocked the disabled person in question. (It seems plausible that he maybe does 'retard hands' like that as a way of mocking people in general, which still is not great on his part, but I'd like to know for the record whether that's really the case or not).