Thanks for the feedback! I will definitely just keep my mouth shut and leave quietly. It really isn’t my problem in the end once I’m gone. I didn’t realize it wasn’t really a good idea to leave a parting gift when you leave, I won’t bother with that either.
I’ve also been working on myself professionally. I’m not blind the the possibility that maybe I WAS the issue, even though I don’t feel that way. There’s always a bad apple in the workplace, but this one’s particularly rotten.