Coworker Calls Guy's Mistakes Out to Boss, He Returns the Favor

There is nothing more infuriating for your coworkers than when you act like a "Regina". Anyone who has ever experienced this knows what I'm talking about. "Regina" is that coworker who calls you out on every little thing, every little technicality. For some reason, something is up their a$$ and they just can't leave you alone. This is equally annoying when you're the manager and have a subordinate that is doing this to their coworkers. You just want to tell them to chill out but often can't because they're a ticking HR-issue time bomb as it is. Props to u/batkevn for paying Regina back in kind. I'm certain the commenters are right and the boss was just waiting for a chance to go ham on Regina.