Sorry that this is a late response but I think other kids inflated his ego. We all saw that his mom makes sure to deal with his behavior and make him work for what he gets (though he's still a bit spoilt). After seeing how he was acting, his mom probably put him in his place and did a major blow to his confidence. Once someone is up that high, you don't come back from it really easily.
He actually cares though. We see that after his fight with Deku. He told him to try his best because he didn't want the holder of One for All to lose.
This would also explain why he was worried about being beat by other students with weaker quirks. He actually cares though. We see that after his fight with Deku. He didn't want to lose but he didn't want to win because of the potential Deku had.
Nothing against his mom though.
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FanfictionTHIS STORY IS BEING REWRITTEN IN ANOTHER BOOK! IT'S ON OUR ACCOUNT SO CHECK IT OUT! Before you read we'd like you to know that this is kinda trashy. There have been mentions of a traitor in UA high. A teacher? A student? How many? What class? What y...