No, the term is used for anyone who is selective about any particular product, service, or genera of item.
As examples:
He is a wine connoisseur. She is a Sci-Fi connoisseur. They are connoisseur's...
Go to a specialty wine store and ask for their advice. Usually most people enjoy 00 - 01 sweetness. There are so many great wines on the market so the pros can help you select one. Good wines don't...