I guess also some people find out by trying. It's scary when you don't know if the response will be "fine, ok then" or "hm, well talk about this later", and you find yourself demoted or encouraged to leave (Europe) or fired (more a US thing I guess).
If you're punished for professionalism, you know it's time to find a different place to work. If you don't it's a one way ticket to stress and depression.
