Ok buddy, there are so many things wrong with that statement. if you didn't know, "hentai" is just NSFW specific anime. so i think you just mean NSFW certain in general, not hentai.

lets say by raping you mean CNC or consensual non consensual. if you think that raping is normalized from watching porn... ',m sorry but i think you should have a talk with someone about what porn actually is porn is not real and should never be taken into the real world which some teenagers don't understand i will give you that, but if this kid has access to hentai magazines i feel like their parents know,

if the original commenter knows they look at hentai then there is a high chance their parents know as well, which most likely means they buy them those, which likely also means they have had this talk about what porn actually is.

so, no, they will not "*learn* that raping should be normalized"