I don't think that learned behavioral responses are necessarily a bad thing. I don't want to cry at work over a work matter any more than I'd throw my hands up in the air and "woo hoo!" at work over a work matter.

At work, the focus is business and emotions are more subdued. Not emotion-free, but usually responses are more "formal" (ie., a speech is given after a big success, a person takes some bereavement leave after a death in the family, etc.). If a person in the office is crying, then other employees are distracted wanting to know what's wrong and wanting to offer comfort, etc. Emotional responses are often seen as some kind of disruption, thus the learned behavior of taking steps to keep them in check.

As far as who determines what's acceptable and professional, that would be the person in charge at that particular business - or that person's boss, etc. Like it or not, well, that's the starting point.