And where did I say people are responsible for the misdeeds of their ancestors? You definitely aren't responsible, but you do benefit disproportionally from a long history of oppression. You shouldn't feel guilty, but you should be aware of it.
Nor was I saying we should be overly attentive to race, I'm simply saying that acknowledging someone's race isn't racist. And I hate to break it to you, but yes people do have a shared experience based on their skin color. Whether you're black and 8th generation American, or you're from Africa, there is a shared experience in the way you are perceived and treated in a society dominated by "white culture."
You sound like every defensive white dude ever who can't handle the fact that just maybe our society is built around us. You are the one who is erasing culture.
Seriously watch that video I linked (better yet, watch the whole movie).