You forgot their leering at and coming on to any American woman they encounter, and their truly ripe body odor.
Having traveled rather extensively in India twice I am well familiar with the vacuous stare. Without a hint of a smile, just this dull, mirthless look, assessing everything you are wearing I suppose. Nowadays, I am seeing almost the same thing from the tourist parents of obvious H1B recipients. And hardly a word of English, of course