That's surprising 😕🤔. How can saying thank you anywhere in world can put someone in trouble, lol. I guess you read it in a humour or in sarcasm. Indian people are really very helpful and kind in nature. We really respect and welcome our guests. Ans as the Saying goes in India, (Guest is God) that is absolutely correct. Even an illiterate person in India can understand 'Thank You', because its so much common. I think you read in other context definitely. Moreover I would like to know @sugandhaseth's take in this.