Once again, Mad Men throws in a reference that's weirdly out of place. This is something like the fifth reference in 20 episodes. There's no way rich white New York businessmen in the early '60s would've mentioned Indians that often.
I have to admire writer Matthew Weiner for including so many references to Indians--even if they don't fit. He's either doing this as an intentional homage or is unaware of his pro-Indian bias. It's strange but interesting, to say the least.
For more on the subject, see Sitting Bull Joke in Mad Men and Mohawk Airlines in Mad Men.