"What the heck is 21 Jump Street?" he's never heard of anything like that and he wasn't sure what it was. Could be something he was interested in though but maybe not. He could tell the sarcastic tone and chuckled a bit though since maybe the guy was joking sort of?
"That's fine. I wasn't expecting to spend the entire night just a few hours." he said and maybe he was coming on to strong, he just thought it would be nice to hang out with kids his own age. Instead he usually just went home and did his homework and hung out with Susan.