One of the most uncomfortable moments of my career was talking to some guys in a pub during a conference, mentioning where I work, and seeing a flash of contempt in one of their faces. This person proceeded to make some disparaging comments about the company and the main product. That sucks, and it's easy to take personally.

However, I once chose to work at that company, have continued to choose to work there, and I get paid for it every month. Who am I to tell anybody how to criticise my work? I'm a professional, and being able to tolerate even harsh criticism is part of what I think is professional integrity.