Something I've noticed over my many jobs. "Professional" means entirely different things at different jobs, and doesn't follow fields either. That is, "Professional" in one field is understandably different from another, but businesses inside the same field also have different definitions of it.

It's almost as if "Professional" is just a euphemism for saying "we expect you to act a certain way, but are being passive aggressive about it so we can't be called out for it".