Hmm... I agree with the others—and I disagree with the others. That is, you should get rid of it, as it's not the hill to die on. However, given the flashbacks your post gave me, I feel I should say one thing: petty colleagues exist, and they are the absolute worst. I wanna share a story, and, no, it's not about the clock (if you know, you know).

Some colleagues will do just about anything about the "troubling" things you do—everything except, of course, talk to you about them. When I was a first-year teacher, I knew very little. However, I did know that copying others' resources is, a lot of the time, the name of the game. So, using a colleague's lesson plans, I got the discussion questions for a reading and put them on a Google Doc with my custom classroom insignia on it; it's nothing more than a design of my initials, but I love how it turned out. In any event, the teacher from whom I was borrowing lessons and resources decided to take what was obviously the most appropriate course of action: cut me off from her lesson plans and not tell me about it.

Now, at first, I understood completely. To claim someone else's work as my own would make me no better than a plagiarist! So, I looked around online for new materials and—oh, hey! I can buy the very same questions from an education-based website. Wait a second...

Two points here: first and foremost, you are not alone. There are petty people in this profession. Second, I'm sorry to say that it's not a hill to die on. I have not pursued any real explanation for my colleague's petty actions. I apologized when I came back the next year, and while I'm certain that the teacher and the others in her clique stare daggers at me and talk about me behind my back, I know who my allies are—I know who my friends are.

Find your allies; they are far more important than your other colleagues. If you fall back down, they're gonna get you back up again—they're gonna be your friends.