Ned didn't seem to read too much or too little into Star-Lord's ego preening. Had he done it like Flash did, it'd be easier to spot, but for Ned, Star-Lord's ego was firmly where it should be - he was a super hero after all.
"What? Oh, no. I still live with my parents?" He was still a kid so that wasn't lame, right? He hoped so. He still looked somewhat bashful regardless.
"I just came to hang out and work on some stuff? I know I'll be moving in later when I'm out of school and this place is cooler to hang out in than like, my room."