Thanks for sharing your account of student life in Taiwan. It's always nice to hear firsthand about life in other cultures so that we don't hang onto our misconceptions. On that note, let me suggest that your caricature of American student life is a little cartoonish. Yeah it's like that in a lot of schools, but if your son or daughter goes to one of those schools then you live in a shitty neighborhood and should move. You're probably right about the means, but the variance is much higher in the US and its very possible to find an academic environment where a student can excel without fear of getting beat up. (Also, the bit about not making it into college being worn as a "badge of honor" is just silly. Why would they even apply?)
FWIW I went to public school in Northern California (the central valley even) and I definitely got positive feedback from my peers for doing well in school, because my peers also took advanced classes. Apart from schools with gang problems, I would characterize it like this: In the US it's your choice whether or not you want to succeed academically. Your peers generally don't care because there are a myriad of other reasons to like or dislike you (looks, sense of humor, clique membership, etc.) So yeah there is not the social pressure to succeed, but for the most part there is no negative pressure preventing success (again, except in very troubled schools.)