and all that message is gone the moment he becomes Chad Hero.
If he were to remain the normal guy, then yes, I would agree, but now that's gone now, now the message is more like: If you are the chosen one, that makes it much easier to be accepted.
She went from resisting to go the opposite side, now she changed sides, even if her former super powerful teacher, the one who helped her in her worst times, were to attack our MC, she will protect him, and she knows, he has the super hero power to protect her back.
If he hadn't become Chad Hero, would it be the same? We will never know now.