You are the one who obviously does not know what the word...

You are the one who obviously does not know what the word "professionalism" means and entails.
This might help: https://www.mindtools.com/av44li2/professionalism

No, I am not (but have been in the past) a retail sales person, and have also employed retail sales persons, every one of whom displayed professionalism in their roles.

Your original comment, strongly suggested that no retail sales persons could be expected to display professionalism insults most of the retail sales persons I've employed, and the ones with whom I deal daily.