So this thing happened to me today.
I was sitting with some people for lunch and a guy offered me some of his root beer. I refused since I don't like it and that's all fine and dandy but I refused it with the words "It's brown. I don't like it." Of course, my friend just happened to be from India.
I was just stating a fact. It just so happens that all the pop I dislike is brown-coloured. So instead of numbering off pepsi, coke, root beer and all that jazz, I label them all brown drinks. No biggie.
But in the end it was fine, he called me racist and I protested and then we made some jokes and no one's feelings got hurt.