First of all I just want to say I agree completely with the way you think on this! Most people who go on to take anthropology classes, history classes, etc. learn at some point that there are no real differences between races and that race is just a fake concept created to oppress people. And I think I even read somewhere that the more educated someone is, the less likely they are to be racist or think race exists.
But I was born and raised in America, and so were my parents. I think the reason race trumping culture is silly to you, is because you have common sense. A lot of the people in this section are desperate to hold onto their "race" and the history of how their ancestors were treated as an excuse to be racist. It's sad. RACE DOESN'T EXIST!!!