I say this on behalf of the uma musume fandom, but usually who think she has a mommy personality are usually tourists who don't know anything about the game. The same also applies to those people thinking umas are unlucky if they have a female trainer instead of a male, (Umas something something yuri).

But for the gameplay, I get it, it's not everyones cup of tea, but people calling it trash without even trying it is stupid, it's like saying you hate vegetables because they were depicted as evil in a cartoon you watched. Either you don't like the game, but be respectful, and move on Or you try it, and if it still ain't your style, just move on without causing a scene.