There is only one question you need to answer at the time:
Are you in the bar drinking when you yourself know and God knows you should be at work?
Yes or no.
Define "should be at work". I'm on salary, I get paid to get the job done on time and on quality. Have I been at a bar drinking during my normal work schedule without the boss knowing why I'm not at my desk (or possibly even without the boss knowing I'm not at my desk)? Hell yes. Have I missed a deadline or allowed product quality to suffer so I could hoist some in a bar? Absolutely not.