Have you experienced this in the US? Asking Indians.
I'm Indian and these strange incidents happened in less than 3 years. In grad school, my first female friend and a date was a girl from China, seeing us together, a stranger White American classmate asked: "are you two together"? "How long do you guys know each other"? (The first time a stranger asked such question, we didn't bother!)
At my job, I have a teammate from China, one weekend we're out for lunch while waiting for the table and talking, a random white American dude in front of us turns around and abruptly asks "are you two together"? (that was weird!)
The third time, I was in TSA line at the airport, an Asian girl standing next to me lost her driver's license and I was helping her to find her license in the line, and once again some white American douche spits the same question "are you two together"? And no other question. (That was so fcuking annoying as if the dude can't digest the reality of Indian talking to an Asian). That girl didn't hear him and was more stressed about finding her license. And I ignored answering him!
And very recently, I was in the plane, next to an old Asian girl (of course 20 years younger looking than any non-Asian women) and we were talking about the Airlines food menu for purchase, and then some psychopath white American dude right behind our seat, abruptly asks, are you two together? I felt like spitting on his face. WTF is wrong with white American dudes?