[It's cute if she's the one doing it! The gestures could stop, though. Or at least, not flip off potential random passerby.]

I'm so glad it meets your approval.

[It's said a little sarcastically, but he honestly is glad... He's pulling his snacks out of his pockets and hoping that they don't get in trouble for bringing in outside food when she makes her offer, and he can't help but stammer with a little surprise. Sitting next to someone in a booth when there's only two people...? That's what people do on a date, right?]

I-I... sure, if you want to.

[No, wait, that was the opposite of a cool reaction. Hang on, maybe he can recover this as he peels his wet jacket off.]

It makes sense to only get one of their seats wet, after all.

[Nailed it.]