I would just hide them on facebook, I would also put them on restricted access to your profile as well.
I have done this and it is great they are still in your friends list but they dont see anything and you have to click on their name to see their posts.
If you love the job and it sounds like you do, keep going be your usual happy self, do not stoop to their level and you will find that one day you dont even care anymore.
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