On the upside, they have no idea about the things he's actually trying to hide. They're just worried (Ghost in particular) that this means there's a friend of Stark's about who might find out just who else they're keeping company with and spill the beans.

No offense, Peter, but based on the last two minutes you're really good at that. At least from their perspective.

"Hah, I like your attitude. I get it. You've got a head for engineering, huh? What kind of projects do you get up to?"