Of course.

It's generally accepted that autistic people prefer to be referred to using language that uses the term "autistic person" rather than "person with autism" because the latter is considered to be externalising autism and denying it as being central to the identity and experience of the autistic person.

Just as we wouldn't say "a person with blackness" or "a person with womanhood" or "a person with homosexuality" because that is seen as separating out the core experience of being a black person, a woman, or a gay person so too does the autistic community feel that phrasing it as "person with autism" has the same effect. (Also in the case of a gay person, the way of phrasing it above has implications of pathologising and medicalising the experience, which is what happens a lot for autistic people too and that has historically been to serious detriment to autistic people.)

For me, being autistic, there is no "outside" of autism; it colours who I am, it shapes my relationship to and understanding of the world (and this extends to how I experience myself) so to put autism as external to me is to imply that it's sort of additional somehow and it gives the impression that there's a "real" me beneath the autism, which I personally reject the notion of.

Note that this is just the general consensus here; some people don't care, some people prefer to refer to themselves as "a person with autism" and that's valid. But as a rule I'd say that it's best to refer to autistic people this way around as it's the preferred term.

That being said, I will sometimes say things like "excuse my autism", "this might be my autism acting up", "today the autism won", and "this is just my autism speaking but...", although I do this ironically.