Sure, racists are interested in race and everything related to it because they feel they are superior, and conveniently disregard the things that don't support them being superior.
But race is not a cultural construct, as evidenced by the fact that you can't culturally adapt your skin to change colors.
It is entirely possible to note the differences between men and women without being sexist. It is also possible to be interested in and note the differences between different parts of the human population without being racist.