What Grinds my Gears, pt Two

I said in my last post that I was going to write about inside racism, which should be inside discrimination, so my apologies.
But before I keep on going, let's start this off with a little story.

Last night I went to go see 300 with a friend of mine by the name of Lo. During the previews, there was a video for Fall Out Boy's "This ain't a scene, it's an arms race". Let it be known that I like Fall Out Boy(the guys can sing their lungs out, play instruments VERY well, and dammit, they are sooo hot!) and love the song that was playing even more. Usually when I hear it, I am singing along, but since I was with Lo, I took it down a few notches. He heard me anyway and said "I don't like this song" to which in typical fangirl fashion I was like "Why not? It rocks!", which led to a discussion on "my music" and "his music". This discussion was made worse by the fact that there was country music playing soon after...Tim Mcgraw if I remember correctly. He noticed that I liked the song "Set of Wings"(I know it isn't the right name but darnit.) and therein accused me of being "white". I of course was irritated. Why can't a person just like what type of music they like, and not be labeled anything?
This leads into my blog entry.
they(we) feel Why do some blacks find it necessary to say what is "white" and what is "black"? I mean, what is the purpose of it? Is there a "black" way of doing something? If so, why don't all blacks do it? Could it be that there are some issues leading to this idea? Yeah, totally. Maybe it is because they feel disenfranchised. Possibly. Or it could be that these people are complete idiots. Who knows. Either way, it all boils down to this: someone is going to think they are better or worse than another person because of the value placed of whatever is being spoken on. This is why I get such a big lecture for saying valley girl terms or listening to Fall Out Boy. The person lecturing thinks that "blackness" is something you can take on or off..thereby giving it increasing or decreasing value at will.

Does anyone understand why I am saying?