This definitely falls under the "nature vs. nurture" debate.
I sometimes get a tad bit uncomfortable with the "racism is natural" statement because a lot of racists Cac love using it to justify their racist ways.
With that said, since the brain loves to categorize, I do think it's natural to recognize differences and categorize them. However, how we react to those differences I think is more based on nurture than nature and the kind of environment you grew up in.
In my early years, I grew up in a multiracial/cultural environment so being around different kinds of ethnic backgrounds never really phased and I never really had any preconceived notations about others because I was exposed to others at such and early age. However, the experience was a positive one and I'm quite sure if someone has a negative experience instead, their viewpoint would be entirely different.
So, for me, I'm more likely to lean on a nurture vote than a nature vote.