straight up not only is moralizing appearance shitty because people in your life will find out that you think they're ugly, it's also a suuuuper easy stepping stone to racism because a lot of features the zeitgeist deems "ugly" are features often found in marginalized groups.
like, i mean, think about what people deem ugly and use as shorthand for "villains" in stories. crooked teeth, being fat, darker skin, bigger noses, hairy bodies; i think if you apply some critical thinking you can see where these ideas come from and why tying them with being "evil" is bad