First, wanted to welcome you to the site. I don't work in the OR, but I agree with you on this. It just seems to make sense to me. Sounds like a disciplinary problem to me. This person seems to be engaged in passive aggressive behavior that needs to be addressed by the manager. As you stated, it is drawing you away from your duties. Do not let this slide. One way or the other, there should be a written policy and your complaints may bring one about.