Calling somebody that doesn't have a
superiority complex someone with a
superiority complex, or parroting back
everything somebody just said to defend oneself. Someone that goes from saying they're better at everything than somebody else (especially sports, music, or things people get spotlighted for) or they always beat somebody at/win at something (especially sports, music, or things people often get recognized/spotlighted for), and do it as if they'd never lost at it once in their life.
The dork girl was always defensive to the point she didn't even know she was (or do it on purpose, consciously or subconsciously), and it was bad enough that she thought that anybody that was slightly
socially aware or self-controlled was either egotistical or had a
superiority complex, since saying some bullshit like that would keep her in her own little winner's bubble where she didn't have to acknowledge that it wasn't just everyone else that wasn't perfect, and that way she never had to actually
straighten out, she could just look and sound grown up on the surface and most people would believe it and never question her.