Sure. But there’s a difference between saying, “I don’t think this person is attractive” and “I don’t think this person is attractive enough.” Both of those statements lead to subjective conversations, but those conversations aren’t exactly the same. Here, in this context, that person isn’t saying that they don’t find Melissa Benoist attractive (which would be fine); they’re saying she isn’t attractive enough to play Supergirl. And the reason for that is because she doesn’t look like a stereotypical model. That, to me, is such a weird and super specific criticism that is itself worthy of critique.
Yeah, and it’s an incredibly specific one that I don’t think actually matters for the character in question. I don’t have a problem with wanting Kara to be attractive or not finding Melissa Benoist attractive; it’s the criteria I think is odd.