A pet peeve from non-Hindus?
When people make assumptions of what I worship, usually something like, "Oh Hindus, they like, worship cows and snakes! I KNOW, *I'M from India!" (said from a CANADIAN Sikh woman! >_>)
I remember being on a flight top India via China, with many Punjabi Sikhs (and Hindus).
It was another harsh reminder of how ethnocentric India is, and the Punjab might be the most extreme example. Not everyone of course. When it gets that preposterous, one can just roll his eyes and move on.