I mean, that's sort of how it's acceptable at all, right? It's almost entirely about the fact that it's like accepted to lust after them or hit on them and the rest that would actually get them busted is not explicitly shown, but there's enough there for you to understand that it's gross.

And I love Japanese games, but even still, currently I'm playing Apollo Justice Ace Attorney, and there are scenes where characters comment on the beauty and attractiveness of Trucy (with no reprimanding from any other character), a 15 year old girl explicitly mentioned to not even be in high school yet.

That's not explicit, her character design isn't sexy, but the behavior of much older men lusting after a pre-high schooler is totally normalized. I think that's more of what you'll see commonly.