would be explicitly liking someone based entirely on their race, and nothing else

That's definitely a thing: fetishizing people because of their race or some other characteristic. I know some weebs, for example, who get deep into that groove. I also have known people who have a kink about having Black sexual partners. And I know two Black women who each like to date white guys and do roleplay with them that involves racial abuse. Both are upper middle class and highly educated. I find all of those fetishes weird, reductive and creepy. But maybe that's just me. Others might draw their lines elsewhere.

I also know couples where the partners are from very different ethnicities, and they're not all weird about it. For example, I didn't get with my wife because of her ethnicity, it was about her intelligence, character and (OK, I'll admit it) strikingly good looks. I knew nothing about her culture at the time.