Maybe look through public records/those sites KF uses to dox people to see if there are any Indians residing there. Those pick up any place you rented. Clay County where Josh lives has few Indians, so there should not be many even if the local Subway owner put up his extended family in the trailer. I would say Hispanics too but Clay County has like 20% Hispanic population so it would not be as sure of a sign on where Josh lives.
Although to be fair, Josh is so deliberately ignorant that it is possible he saw brown Hispanics cooking Hispanic food that he did not recognize (that is, it was not Taco Bell) and celebrating some Hispanic thing and assumed it was Indians.