I have no idea! Especially criticizing a proven singer who can still back it up when necessary.
It's sometimes necessary for an artist to utilize lip-synching. Human beings need to take breaths irregularly when they are doing vigorous physical movements. If an established singer knows that they are going to be dancing or moving quite a bit during a certain song, why would any sane person criticize them for lip-synching so they can continue to deliver a performance that is expected of them?
It's quite ignorant. She's not only a singer who stands still and sways her arms and flicks her fingers as if she's masturbating the air. She's a entertainer. Something most girls wish they could do half as good, and they all acknowledge Bey is the best. Which is why she gets so much criticism from haters and trolls. I literally just ignore those threads now tbh.