Take on the Indian guy

I was talking with an acquaintance the other day about this great HP touchpad I got for $99 as part of that HP closeout sale and mentioned that i was thinking about upgrading it to the Android Honeycomb operating system. I wasn't doing it because I dislike WebOS as it's actually kind of cool but was doing it because the HP app-store is a total graveyard and with them shutting down the production of these things nobody believes that any developers have any long term plans to create software for it
Long story short is that when I was discussing it, one guy mentions that the IT guy at work could do it for me. I say "oh the indian guy Jinesh" the third guy we were talking to looked at us like we had two heads each I know he was seething and was just dying to say something like 'not all IT guys are Indian you bigot'
Except for the fact that this guy is in fact an Indian. I have known him for 10 years, seen pictures of his kids and wish him a happy Diwali so although my acquaintance thinks I paint with too broad a brush I actually just being descriptive
If I said the Russian ballerina nobody looks twice, the Japanese sushi chef is completely acceptable Now tell me why you can't refer to the Indian IT guy or the Jewish Lawyer.