Nice.  I love it.

Mind if I steal your tactics?

There are bunch of Indians where I work.  I don't know, don't care to and don't have to meet 95% of them.  Among the rest, most are very nice, not that different than my colleagues of other races.  But then, there are one or two who tend to get on my nerves with asinine comments as you said above.  Well, granted that they might just be pulling my leg, but I'd like to respond with wit rather than anger.

When somebody says Nepal is part of India, I normally say whether he got a fake degree from Bihaar because he does not know such a simple geographical/political fact.  Then I go on to challenge them whether they have fake resume and even fake immigration documents, yadda yadda yadda.  Finally, when it reaches a point where they begin to wonder if I am joking or being serious, I just put a big smile on my face and say I was just kidding.

Next time they say Nepal is part of India, I tell them not to get me started again.  They just shut up after that.