The only reason her fans are angry id because it's true.
She's an incurable power bully, forcing fledgling songwriters to forfeit composer credit to her just because her name is Beyonce. No one is beyond plagiarism, because this is what it is PLAGIARISM, MUSCULAR PLAGIARISM.

There is nothing wrong with singing someone else's songs. Whitney did it, Celine did it, Toni Braxston did it she too must do it. There is no amount of bullying or money, or powerful father (the true source of all of this during Destiny's Child era) or husband that will ever make her what she's not: a songwriter. The day will come when she faces a public embarrassment she cannot avoid by calling the songwriter and shutting them up with $50 000.