This is a good question and i think i'm qualified enough to answer this one . because for one my girlfriend is an "indian american" ( born and raised here ) and i'm an indian who lived there ... I don't think it's just indian Americans, it's overseas Indians in general, hell even a great deal of INDIANS in India dislike other Indians. read more
That being said, Indians do have the reputation of being abrasive. Maybe it's just you. read more
I have researched online and asked many people in person about this dilemma. The most common answered I got was that Indians hate black skin and they have inferiority complex. That's why every second advertisement on their Televisions is about skin whitening products. They hate blacks because they do not want to associate themselves with them. read more