to the point and in brief Asians are low category people for most of the USans
There are two factors one Rationalistic and latter is religious. to count there are many many instances.
But it was really a shameful act Former Indian President being treated this way.
Even Most shamefull fact is that still Indians think america as heaven land and still prefer to land there despite receiving lots humiliation. where as India has 1000 times better talents than those rationalists.