Heh... She's right, of course. Nobody is capable of more than their best. Even if you can't obtain your goals, there's no shame in that.

[Taking it from the fire, he blows it out and waits a few moments.] Watch this! [A bit of tugging on the burnt part aaaaand it slides right off like an outer skin, revealing a perfectly melty but clean marshmallow.]

Ta-daaaah! How cool is that?! [Yato, you're impressing no one.]