I had an indian lady try to haggle with me when I worked at a clothing store. I had to explain that we don't haggle. She got very upset with me and told me I had just lost her business forever.
My friend Kashen is indian, but born here. His parents are very quiet and polite, but they nod their heads for no reason when you talk to them. So, his uncle was doing that to me one time and never even replied to me when I was done talking. I was confused. So then, right in front of his uncle, Kashen says to me, " He doesn't understand a word you're saying." Turns out he was just nodding politely because I was talking.