No, they aren't afraid. They just have their own comfort zone. Have you ever had someone teasingly say, "You're in my bubble. Get out of my bubble." That isn't about fear. That's about personal comfort. In the case of a T, it is probably about professional comfort. People have a right to define for themselves what happens in their own space. They have their own reasons for whatever that definition is, but it ISN'T about you. It is about them. When you can accept that people just have needs for their own personal space, then you can perhaps just respect that for them that is what they need and it really has little to do with you.