Joey got nearly bitten by shark while swimming, Actually Families of Dave & Joey are on vacation, so Joey & Dave having dinner together with their families.
Joey: Dave, I was in a car accident once, okay? And it was really scary, I had nightmares. But when...
Dave: I've been in a car accident, too. Have you ever been bit by a shark?
Joey: I was never bit by a shark. I'm just saying that I understand. My...
Dave: Say it again.
Joey: I was in a car accident.
Dave: No, say the last part.
Joey: I was never bit by a shark.
Dave: That's it! Then you shouldn't talk about it. And I'm not gonna sit here and try to explain myself to a bunch of black and white suburban trash who don't know a damn thing about the ocean.
What does it mean by "suburban trash" ?