As far as beauty standards are concerned, due to a long history of racism, plunder, and racial profiteering in the united states, beauty standards are absolutely affected by racism. People are able to like who they like for whatever reasons they wish, but excluding peoples of a different race from one's romantic interests is most definitely racially motivated and prejudiced.
I suggest you travel more and see if this is true in practice. There is not a lot of data which reveals what goes on in the subconscious of people who decide not to date certain people. In my own opinion though I doubt 100% of people who have preferences are also racist. So there are people who aren't racist who still have preferences and how do you know which group of people make up the majority of the people who for example refuse to date black people for example?