At that time, they backed off - likely because Knight was a black woman.
Now? She'd be canceled so fast...
I just checked. She’s still alive at 76. Someone should ask her opinion.
She also sang the National Anthem at the Superbowl two years ago: https://www.mediaite.com/online/gladys-knight-defends-singing-national-anthem-after-don-lemon-suggests-it-could-hurt-her-career/