I think you are wrong. The “thank you” text back really says: “I got the message. I understand the message. I appreciate your taking the time to do it.” Only it says it in two words.
– New York Times.com reader elbro27, in a comment on a post by author Nick Bilton about the rudeness of people who send an email or text just to say “thank you,” which he finds to be a waste of time for people swamped with digital communication