There's a guy I work with that does this _in real life_. Let's call him Bob. Bob sits maybe 15 feet from me in the same room. We work on the same kinds of thing

There's a guy I work with that does this _in real life_. Let's call him Bob. Bob sits maybe 15 feet from me in the same room. We work on the same kinds of things. In this company, it's encouraged to engage with others immediately if you have a question. If they are too busy right at that moment, they will tell you and check back with you later and everyone knows not to take offense in these situations. However, Bob pretends to be afraid of me. People walk up to me all the time when I'm working and ask questions and it's perfectly fine. But when Bob has a question, he _whispers_ to get my attention. Or he'll stand just in the periphery of my vision and literally wave until I respond. I've told him, nicely, more than once, that he can just talk to me whenever he wants. His response is always along the lines of, "well I didn't want to break your concentration" or, "I didn't want to bother you if were busy." Bob knows I don't ignore people whether I'm busy or not. I don't want to believe he does it just to annoy me but I'm failing to come up with a more logical explanation.