From my personal experience, I've only seen 15-17 year olds talk about it since they're all going through the fucking gender trend
, while most children just watch teh cool animez.
I think it's due to the fact that they're hardly any quality toys to advertise the show, and the center characters aren't exactly drawn in an appealing art style.
That's another thing I wanna talk about is that the boarders have stated they purposefully chibi-fied Steven, in order to make him look "cuter," but that failed really hard since Steven is pretty much already an ugly kid, what with his sausage limbs, Voldemort-pig hybrid nose, and a lack of neck.
Kids aren't really into that stuff since the general key to a successful cartoon, commercial wise, is to have an appealing art style to make loads of toys with. Just look at the original PPG.
Boys aren't going to like it because it's not "cool" and girls aren't going to like it because it's not "cute." Which is kind of funny because Rebecca Sugar has stated it's supposed to be a gender neutral cartoon, even though Lauren Faust has said CN rejected her cartoon because they told Lauren they already had Steven Universe as their girl show, which proceeded to almost make Sugar cry on public.
But I don't know, that's just my two cents anyway.