Are you here just to vent your frustration, or are you here to tell people their free advice is no good? Because I agree with SomeGeezer. If you can't find the "get-over-it switch", you'll just have to take a "get-over-it" pill, or do whatever you need to do. then file this one in the "don't casually fuck the people you work with".
That's just all there is to it.