Half caucasian, half Okinawan here.

I look ethnically ambiguous and have been mistaken for a dozen or so different ethnicities that I'm not. I'm basically a white guy with a permanent tan and round features who could be asian/native american/hispanic/filipino/palestinian/whatever. The asian half of my family is highly americanized and people basically treat me like a white person when speaking with me

However,

There have been a few instances when I have been walking around urban areas at night wearing "street clothes" (jeans, beanie, baggy jacket) and have been stopped by police or security guards, and their tones of voice were much deeper and more confrontational than I I'm used to. After I started speaking (like an upper-middle class white guy with a mid-Atlantic accent) they immediately became friendlier, their body language changed, the pitch of their voices rose, and I could tell at that those moments that I had gone from being "ethnic" to being "white" in the minds of those cops/security guards.

At a time when we're having a national dialog about the concept of privilege and how it benefits white people, it's weird to actually be able to see your white privilege suddenly "turn on" in the middle of a conversation and how differently people can treat you because of it. I feel bad for people who are constantly watched and barked at like I initially was in those instances.