Seeing how other people look often affects what we think of them, whether we accept them, criticize them (unspoken or not), and how we treat them--based on their appearance. However, it isn’t how other people look, but how other people behave, or what they say and do, and how they say and do it, that impacts us and workplace productivity.
A true test: wouldn't we prefer to have other people determine what they think of us, and how they treat us, based on how we behave, not how we look?