Just the opposite actually...one could make the argument certain subgroups of Europeans established rules for "whiteness" specifically because things like the "one drop rule" wherein ancestry is not immediately obvious.
This is where with you I wonder if you're being intentionally or incidentally obtuse; in that race itself is a racist construct that completely ignores physical features(the supposed guidelines upon which your attractions are built) in lieu of categorizing people by their ancestry. So to base a supposed attraction on race only feeds into said racist construct.
But as I get older what I recognize is a lot of the times what people wont say speaks more volumes than what they do, and I can understand the philosophical corner a questioning of preference can paint one into. Honest as it may be(and probably completely removed from any malevolence), I can see a self check in play if someone were to say they simply werent attracted to darker skin, independent of race, or even specific features such as wide noses, or full lips. I can even understand not wanting to be so forthcoming with admitting one's upbringing was so immersed in white supremacy that their community and household didnt possess positive sexual and leadership archetypes of black folk. Even the concept of a racially homogenous upbringing makes so much logical(and morally benign) sense it makes you wonder why people are just so quick to lean into the preference angle, and why so often that preference is reserved for blacks especially while other races possess virtually identical appearances.
