You really ought to get your eyes checked out.
Dealing with a coworker who irritates you can be one of the most difficult challenges you face in life. This challenge arises when the person who annoys you does so for various reasons, not all entirely justifiable, and when you have difficulty identifying the specific cause of your irritation.
The thought that may cross your mind is, “Doesn’t this guy have any eyes?” Or, you could say, “Why did he bother to ask such a stupid question if he was just going to keep demonstrating?” if someone at your place of employment approached you after you had finished using a machine and explained how to run it, what would you do?