It's not racism. It's no different to Sony (Avi) saying, "You'll never see Ben Reilly as Spider-Man."
Edit: I hadn't clicked yet, now I have. The question also included Ben Reilly and Miguel O’Hara, so that's that. How can somehow honestly claim racism at the Miles (and Miguel) shut-out without just conveniently ignoring Ben Reilly? To clarify; we will never see an identical, white clone of Peter Parker as Spider-Man on film.