There have been many people questioning Spider-Man's attitude in the car thief clip. Some feel he is being too mean spirited, whilst others believe this is Spidey's trademark personality. Marc Webb explains the scene to MTV, here is what he had to say:

MTV: Judging from trailers and the few scenes that have been released online, the takeaway for me is that this is a grittier "Spider-Man" movie, a bit more dangerous than some of the more cartoony takes we've seen previously. But the prankster side is still in place too. There's a clip online of Peter really toying with a guy as he's webbing him up, so the comedy is definitely there. How did you find the right mix of comedy and darkness in this movie?
Webb: I wouldn't say we were ever after pursuing darkness. We just wanted to keep things real. I think it comes down to everything having to emerge from a real place. The reason why Spider-Man is being so playful in that moment is that as a character, he's feeling drunk on his power. He's having a really good time. He's becoming a bit of a bully there. He's not being deeply altruistic, and that's something you'll learn more about when you see the movie. It's a reflection of his attitude: He puts that mask on and the shy kid is gone. He's now this really empowered superhero. That means having fun, sometimes at other people's expense.