I totally get it. If I were famous I probably would do that all the time (fortunately I am not). I don't hate people, I just don't need to always talk to them. Sometimes I just don't want to talk to people, especially ones I don't know. I'd rather... well, do anything else, but by myself. Sometimes I am OK to talk to other people, but it's my choice, not one of a random person. Email is much better because you can choose when you send the mail, when you read the mail, and you don't have to perform on demand (for an introvert, social interaction is hard work).