There are other instructors if they're that sensitive. I prefer to say it as it is: having somebody walk up to you and go "hi, I want to know my ability but I have no idea what it is or where to begin guessing" is a major bother plus a waste of time for me and everybody else who wants the same help.

Figuring out those abilities is not like waving a magic wand - if you go to a doctor you don't expect them to successfully treat you just by saying "hi I'm sick! fix me!" either. This is the same.