It's explained why Jazz speaks the way he does. All the Autobots monitored Earth's frequencies and the Internet. It seems Jazz just latched onto a particular dialect he liked, and don't even pretend that Ebonics type talk isn't ALL OVER the place. Bumblebee clearly took a liking to hip-hop tunes. Each Autobot has their own personality. That doesn't make Jazz "black!" He's a robot!

Why don't you get offended by something that's actually important, like Darfur or the Oil-- I mean Iraq War?