Anyways the societal view of sex as a shameful ≠ a societal acceptance of non-sexual people.
Sexual shame is intended to give people a deep sense of inadequacy and impurity over basic desires. It’s intended to make a person ashamed of
themselves
so that they will listen to authority figures who claim to have a solution to this “impurity”. So an ace or sex repulsed person who is less receptive to sexual shame, either because of a lack of sexual attraction or a strong dislike of sex, poses a threat to whoever that authority figure is.
This makes the idea of non-sexual people as “broken” and “subhuman” of great benefit to the power structure because it provides ace and sex repulsed folks with a different reason to be ashamed of who they are and subsequently makes them just as easy to control as the rest of the population.
This is why we can’t separate the movements for sex positivity and ace acceptance. At the root of it, both groups are fighting against the same thing, so we need to work together if we want to be effective.