Dear lord, the snark in here...
Anyway, aside from hiding from the cops in the beginning (and he clearly must have wanted to be seen there), Bruce going undercover twice to get information is a form of stealth. Ditto right before he powers on the Batmobile. It was in hiding, and he was stealthy about marking the truck. The fact that he is obviously not stealthy after this does not change the fact that he was shown to be capable of stealth in this film. It wasn't his primary operating procedure. Which is an argument you can make about Batman, period. He has a loud car, a loud jet, and he intimidates and kicks ass when he needs to.