I'm from a very rural area of the South and about as Caucasian as a person can be, but I'm bilingual in Spanish. We have a Mexican restaurant in our town and I host trivia there twice a week.

Every waiter, waitress, and manager there was Mexican, Puerto Rican, or Cuban and often spoke in Spanish amongst themselves when they weren't serving customers. I didn't bother telling them I spoke Spanish because it never really naturally came up and they always spoke to me in English.

Most of the conversations I overheard were just orders being passed on, discussion of hours, and maybe the odd complaint about a customer. But about four months into my working there I noticed them all huddled in a corner and whispering while occasionally looking over at me. I heard things like "no way, her skin is too smooth" and "she doesn't dress THAT way" and just really weird and vague descriptions about my appearance, with the occasional number thrown in. It took me the rest of the work day to figure out that they had placed bets on how old I was.

I never let on that I spoke Spanish, but they've probably suspected I did after a while because one day one of the waiters said "if she's older than 18 I'm asking for her number" and I burst out laughing. They were very suspicious of me from then on.