Why a jocular PM Modi said 'you're called 'hotel motel Patel wallas'

A jocular PM Modi today referenced a cliché used in the US to tell overseas Indians how they could encourage tourism to India. "You people are known as 'hotel motel Patel wallas', can each one of you influence five people to visit India?" he asked, in a video address to the Saurashtra Patel Cultural Samaj of USA.