@eviljackspicer To some extent it's a manga/anime stereotype thing, but Japan apparently
does have a problem with schoolgirl prostitution, so there's plenty of guys willing to do it. Because of that, it may be a more reasonable assumption in Japan itself.
That said, I understand why people, guys in particular, get upset seeing it happen. It's a horrible accusation to make against someone, especially with the only evidence being "middle school girl is living at their apartment." There's a lot of ways that could happen legitimately.