Pretty obvious from that wardrobe malfunction that none of the judges are black dudes. (I.E. there is no junk in that trunk).
You can’t be serious. She has a perfect ass. She has perfect shape, tone and perkiness. Her ass is ideal. It’s way better than those oversized flabby ones that are popular nowadays.
Appreciation of asses, like all aesthetic determinations, is entirely subjective. People can like whatever they like, and no answer is better than another. Her ass wouldn't be my ideal ass (and I can appreciate a small ass and have many times), but it that is your assessment, it is perfectly valid.