It still sounds like you're attacking fans, what with saying that this manga shouldn't have gotten this much attention.
And how exactly does High School romanization give anime fans a bad name?
Ecchi and things like loli are more likely to give anime fans a bad name than the fact that most anime and manga are based in High School.
As for you not liking Bloom Into You, that's fine. But you shouldn't criticize the fans of the work. That's a fine way to get people to not listen to you.
High school romantization gives anime fans a bad name because it's childish. I don't want to go back to that time in my life because I was a kid. Move on. Now, knowing that high school is full of kids, high school anime/manga and loli go hand in hand. Finally, I will never respect this fanbase, for reasons previously stated.