I had a manager argue over the cost of a training class once. They'd moved me to a new team with unfamiliar tech and I wanted to bone up on some concepts before getting started.
It was an $11 online class on Udemy.
(Well, technically it was a "$199" class, conveniently discounted to $11. You know how Udemy rolls.)
Generally, I'd say nobody's that petty. A manager would typically only be that petty if trying to get somebody to leave. However... this guy was not very good at his job.
I don't think he was literally upset over $11, and clearly our relationship was on the rocks at the point, but I'm not sure what his exact problem was. May have been me on a personal level. May have been the fact that I wanted to spend a working day uh, learning to do my job better. Perhaps he didn't feel anything on Udemy could be worthwhile. Perhaps it was just his fragile yet rampant ego. Could have been any of those things or all of those things. Nonetheless, it's hilarious that an $11 class was where he attempted to draw some sort of line.