[FraaJad]

Well, I can see that happening. Even within "Indian" groups, people tend to group themselves with people from same state/language. People from some states are known for almost hostile exclusion of people from other states, including neighbouring ones. I speak this from experience as an Indian living in the US.

As regards to lunch, many Indians are very selective about eating habits (for religious reasons). That prevents them from eating in meat-'contaminated' areas.

None of this excuses them from socialising however.. But, socialising with people you already know is easier than making new connections. Which is just lazy, IMO.