Actually, booing IS called for in an entertainment venue. Even at Carnegie Hall, if the performer is just no good. This "no booing allowed" nonsense is a very modern invention and should be done away with forthrightly. How is a performer or stage character to know how badly they stink, unless there is immediate audience feedback. Also, booing is the ultimate form of courtesy. It discourages bad performers from returning to the stage, thus sparing future audiences the same bad experience. This is the timeless lesson of the Emperor's New Clothes.
It is polite to boo a disgraceful presence on the stage. Please have some consideration for future audiences.