I work at a small company with ~20 employees at my location. I'm the supervisor that closes the store two of the seven days of the week.
Recently I found one of my closing checklists from almost a month ago with notes on it from the General Manager listing mistakes I allegedly made during that day's close. This checklist was pinned on the cork board at the back of the office quite literally everyone working at the store uses to store items or do paperwork, and it is very visible.
Needless to say, finding this checklist alleging mistakes I made (one was quite serious, alleging I failed to lock an exterior door) out where everyone can see it rubbed me the wrong way. I've been working for this company for nearly two years and this General Manager has been working at this company for a third the time.
How do I get him to bring up issues he has with my performance instead of "complaining behind my back"?