I'm sorry it comes as strange to you. I hope you're not implying it didn't happen because you haven't experienced racism.
I'm a little older than you (if that is your age up there next to your avatar) 20 years ago several boroughs of NYC were still experiencing quite a bit of turmoil every time someone decided to date "outside" their "race" and my husband and I faced quite a bit of idiotic antics from people (both "black" and "white") 3 landlords flat out told me they just didn't want "any trouble"

I did feel like it was something out of a corny after school special about racism, except we were ending up not being able to rent in any of the areas we needed to live in despite having passed their credit checks and having cash in hand for rent and security.
From the time my oldest daughter was born (almost 24 years ago) to when my youngest was born (15 years ago) there was a big difference in how people reacted to our family.
We left NYC about 7 years ago (job opportunity for me) and were glad to discover that only a few hours up the Hudson people seem to be a lot less tense about "race" the kids here don't feel the need to harass my kids about "choosing a side, you can't be both" maybe because more than 1/3 of the kids in my daughters classes everywhere are "biracial" and likely not to "choose sides" finding it quite acceptable to be "biracial"