Learn English – Noun describing the act of controlling one’s own mind

Consider endeavor

[mass noun] earnest, prolonged, and industrious effort: enthusiasm is a vital ingredient in all human endeavour

You could call people like that "turncoats" or "renegades." You could describe them as "dissident."

No single verb I know quite captures what you've described, but try "abandon," "desert," "betray," "defect," or "dissent."

Words that fit into the blanks in your sentences are "resents," "scorns," "rejects," and "disdains."

When someone is different from their origins, especially when a child is different from his or her parents, people say, "The apple has fallen far from the tree." There are lots of variations on the phrase "too good for," and in this context someone might contemptuously say, "They think they're too good for us now." When people mock others for qualities they themselves exhibit, like the partier who looks down on other partiers for partying, you might say, "Look at the pot calling the kettle black."