I really get this. There are times when I am so deep in thought that people can't break through. Then they start with the sarcastic, "Earth to..." or "Hey, did you fall asleep?" or "Come on, get with the program."
What I find so offensive about those types of comments is that they assume there's something wrong with me because I am able to focus at a level beyond what most people are capable of achieving. For some reason, in Western society, an ability to focus and concentrate is seen as a negative trait. I will never understand that attitude.
Best Wishes!