Your example is overly focused on a small detail. I think what the parent commenter means, is that it's fairly uncommon to see highly attractive women who subscribe to the idea of "everyone is beautiful" date conventionally unattractive men.
“Conventionally (un)attractive” aren’t well defined, but usually mean someone at the intersection of several/many beauty standards. Thin, busty, blond. Tall, dark, handsome. Pale, smooth skin, double eyelids. I just used one example for my post but the concept applies broadly.
And the same applies to attractive men with unattractive women. It's not necessarily a women vs men issue.