I may not be understanding your question here but what does having a pro card, or not having one, have to do with being annoyed if someone came in asking for help selecting products?
I would assume if you are working for MAC (since it is a retail company), you should expect be asked constantly, if not annoyingly, by customers on products recommendations and suggestions. Even by customers who own the Pro card. Not everyone that has a Pro card is in the Makeup Industry, as it does apply to hairstylists, etc.
If I went into a store and was met with an employee who seemed annoyed by me asking questions, and the like, I would excuse myself and go to another one, who I hope would be more helpful and friendly. Or if it's that bad, I'd leave the store.
Then again, maybe I just don't understand.