It depends on the person and the amount of respect they give you sometimes that can determine whether or not they look you in the eye. Some shop vendors I clearly remember looking me directly in the eye and smiling trying to win my business. I also have a group of business associates/friends who respect me so much that they always let me have the last word. Not trying to toot my own horn by mentioning this but they look down upon themselves a bit when I'm around and I think they're just intimidated a bit because they also speak without looking at me. They make suggestions and comments in short sentences looking away, I can clearly remember each one of them doing this as if they were almost afraid to speak. I have to remind them to look at me in the eyes so that I can trust them. They seem a bit self-deprecating and I think a lot of this stems from the disparity financial status and education. I honestly don't like feeling this way so I always remind them that we're all human but it doesn't seem to work. It's the same way some maids look down when they are working. Please don't misunderstand me, I'm just sharing.