In anime you can do this shit where a 5' female can kill grown men with her bare hands and generally be badass and intelligent. It's a fictional cartoon, anything goes. But you take these little 3D girls and put the tittle "i kill giants" next to them with a some sort of giant creature and it just comes off as stupid.
Oh okay, so it's even worse then. It's not the power pixie trope, it's just a vessel for female hubris. It's fodder for the real life power pixie trope where dumb little girls highly overestimate all their capabilities. Cause you know, you can't tell a girl to not drink alone in public, or walk around at night, or start physical violence, because they're all superheros like Black Widow and it's sexist to think otherwise.