White Girl

So last night I'm walking home with A and giggling about something. We pass a group of young people on the street and one of the dudes yells out, "Hey, white girl." Umm? What?
It REALLY bothered me. I mean, he didn't alter the truth. I am white, and I am a girl. But somehow it still sounded derogatory. If I would have turned around and said, "What up, brown boy," I don't think it would have been well recieved.
I got really angry, and I can't pinpoint why. I wonder if skin color as a separating barrier will ever go away? Sadly, I don't think it will. Maybe one day humans will all become the same color, and it will no longer be an issue. I guess that would be a hell of a lot more sad.