[Laughter isn't what he was expecting, but he'll take it! He grins and chuckles himself - he likes this girl already.]

You'd be surprised. Most've the schmucks in my town are so dumb they wouldn't notice if they were suddenly covered in glittery rainbow stripes! [He outright cackles at that. Gravity Falls is such a stupid place full of stupid people.] And hey, I'd be doin' you a favor! There'd be all these jerks who wouldn't say something 'cause it's "rude" or "not appropriate to point out someone's skin's the color of a crayon" but then you'd never know! I'm a misunderstood good Samaritan here!

[He's kidding, but clearly she can take it.]