I would not go that far. Many good people have faces that are not good-looking, and there are plenty of psychopaths who are good-looking. I have avoided plenty of women who were high-grade in the external sense, but utter trash in everything else. And then you have women who are not very impressive physically but very beautiful in everything else. The latter are worth more because they require a better human core to cultivate values, behavior, and a sense of being rather than being born with good physical genetics.
It's just that often people who look worse might cope worse with life on average, while good-looking sociopaths can have better behavior since they are physically gifted. The latter can pretend to be better socially, while some outliers among not-so-handsome people have a chip on their shoulders. Plenty of terrible people are like the mid-grade who envy the nice-looking people. These people populate most of the gossip and vindictive spirals on the internet.
But here is the thing, you are right in the sense that, good-looking people look uglier when they are rotten. I have no interest in a woman who is rotten, even if she were 10/10. People lose the nuur on their faces.