Jimi Hendrix was an entertainer. Louis Armstrong was an entertainer. Elvis was an entertainer. The Rolling Stones are entertainers. Micheal Jackson was an entertainer. Chopin was an entertainer. David Bowie was an entertainer. Bruce Springsteen is an entertainer. And yeah, Beyonce Knowles is an entertainer. You can be a great entertainer, or showman, and still produce really good music. In fact, they start using the word genius when the showmanship is great and the music is excellent, think Ray Charles.
To say you don't like her music is one thing. To say you don't like her and belittle her is another thing.