Breaking up a no-hitter with a bunt requires bunting for a base hit, which is orders of magnitude more challenging than a sac bunt. It's not as rare as pitching a no-hitter, but it's rare enough to be notable when it happens. You have to place the bunt in one of only a handful of defensive dead zones and it requires elite base running speed.
Well, it is obviously subjective, but bunting can be used to prevent no-hitter which is why I personally see it as disgraceful.