Where I live in the southeast, I rarely see black or Latino people in Starbucks. However, when I went to Atlanta recently, I walked into a Starbucks and I was the only white person there (including the employees). It made me wonder if minorities feel uncomfortable and awkward when they are the only person representing their race (whatever that term means, it's actually a biologically vague term).
What's way more uncomfortable for me is when I'm with a group of people and they all are religious. One or two people say something about god or scripture and almost everyone else will sort of nod their heads and smile. It's sometimes at that moment when I wonder if there might be a flashing neon "ATHEIST" sign above my head.
When I'm chatting with a stranger at a gathering (being sociable is VERY hard for me, I'm not a social butterfly, but a social moth), it's usually natural to talk about what you know or about what you're interested in. I'm a biologist/environmental scientist and like to learn cool things about the universe for fun. However, I hesitate to bring up a subject that I think is fascinating if it implicates evolution and I'm not in a group of educated biologists. I've been in a situation where I felt like me dropping the E-word caused the tension to increase exponentially to the point where one could lacerate it with a sharp object.