"Person with autism" seems a little insulting to me. The implication is that autism is shameful and you don't want to associate it too closely with me for fear of offense... Obviously autism isn't all there is to me; but you don't say "person with" for what you consider neutral characteristics about me, for example, "short" or "sophomore", which define me less than autism does but still don't merit person-first language. Obviously someone who says I'm short knows very well there's more to me than shortness. That they're still using "person with" for autism seems to me to say that they don't really understand, deep down, that being autistic is no more of a reduction of my personhood than being short. Autistic should imply personhood, just intrinsically, the way "female" or "child" implies personhood. We shouldn't have to use person-first language to remind ourselves that disabled people are people too; and when you do, it makes me think, "Okay, I know s/he's just trying to be polite, but it sounds way too much like someone trying to delicately side-step an embarrassing fact."