Your reasoning contains the same assumptions, just in the other direction. You seem to be saying that if masses of people enjoy something it must be “bad” on some level.
- Princess Peach is exactly the type of "conventionally attractive" character the poster was mentioning. A young, white, blonde-haired, blue-eyed, damsel-in-distress - https://en.wikipedia.org/wiki/Princess_Peach
You didn't make the distinction "is not necessarily" in your first comment. That changes the connotation.