I found school bullying to be worse when I went to a public middle school just because you ended up with larger scale racial tensions/culture clashes, as well as a sense that the parents of the public schooled didn’t give a damn.
My adventures in a private High School were actually petty good as most of the guys of my class ended up in a single well knit group with a stable hierarchy. There was also the possibility of blowback on your family honor (and financial standing with the school) that seemed to help regulate people from making too much an ass of themselves.
Oh, and First World/Second World/Third World has somewhat lost it’s initial meaning to imply NATO Nations (1st), Soviet Bloc (2nd), and the Unincorporated (3rd) However the Second World basically fell apart with the collapsing Soviet Union and the end of the Cold War, making the classification anachronistic. Though the term ‘Third World Country’ has somewhat retained a negative connotation of being a backwards and relatively unimportant land.
Also, I’m impressed to hear that your character can actually ‘get over’ killing zombie children after you mow through enough of them.