Let me start by being very clear that my belief when traveling for business reasons means your actions are representative of that company; irrespective of if you are "working" at that particular time.

Given that preface, the overall sentiment I get from this is that someone who is not paying for a service should be more accommodating for someone who is paying for the service. In this case, the non-rev FA should have simply realigned their bags for Cow.

But...let's turn the tables slightly. Cow did not pay* for the J cabin directly. You now have 2 people who did not pay to be in that cabin trying to use limited space. Or a situation like this arises being an eUp passenger and paid-J passenger...is the expectation then that the eUp move their bags to accommodate the paid-J passenger?

*Yes, I know he paid for a PY seat and eUpped. The eUp credits in return for the J cabin could be considered a form of payment.

Again, let me be clear that I am in no way justifying the alleged actions of the non-rev FA. I am simply adding a different scenario to see if the sentiment would be the same.