Interesting topic. To me, there are differences between "having a type" that skews toward certain races based on physical characteristics and "essentializing"/fetishizing someone. In the former, there is room to be attracted uniquely to the individual. In the latter, they're just a stand-in for the idea or fantasy of a person that you're using them to live out. It's also possible to make this mistake even without race as a factor.
Now, I'll be first to admit, it's easy for the two to blur. I really do buy into the idea that our "types" are based on early adoleacent experiences, and it can be tough to authentically act outside of those patterns. I definitely see echoes of my first experiences in who I'm attracted to today. But I've had to learn to be careful about, for example, projecting what I liked about an ex onto other people…
What I will say, though, as a gay black man, is this: no one ever thinks twice when I date white guys. It's practically assumed. But if I date asian, pacific islander, or Latino men (especially—god forbid—back-to-back), people—not the person I'm dating, mind you—make comments and ask questions.