Think of the criticism as constructive feedback to help you perform your job duties. Include an example of how feedback has helped strengthen your working relationship with that bartender.

"During a busy shift, I had changed out three different beer kegs simultaneously. After I change out the kegs, I take the empty ones, put them out by the loading dock, and then go to the bar to make sure the beer is pouring correctly. Unfortunately, I was moving quickly and had to restock the ice and didn't check the beer.

When the bartender poured a draft beer, it was all foam. However, she was direct and reminded me to check the beer because it slowed her down.

Even though I was disappointed, I learned that I consistently follow the process. Otherwise, I may have to repeat the process, which slows everything down."