The person who posted the picture thinks it is funny. The store has put up a confusing sign. I have never seen a sign like "entertaining cheese." It isn't a phrase used in the US. Maybe in the UK? The store almost certainly means the cheese is for parties or guests. It might be the place where they keep fine, expensive cheeses. They might have a different place in the store for everyday, inexpensive cheeses.
The person who posted the picture intentionally misunderstands the sign. He pretends it means that the cheese itself is entertaining. It is amusing cheese, it is cheese that will entertain you by telling jokes, singing, or dancing. He says he has been waiting for thirty minutes and nothing has happened. The cheese is just sitting there. It isn't telling jokes, singing, or dancing.