Still grasping at straws....
That's what he said. It doesn't look like he was trying to insult him.
“Two of the great artists of our time representing the groundbreaking legacy of hip hop in America, LL Jay Cool J, uhhh … ” said Biden as the audience began to laugh. “By the way, that boy’s got— that man’s got biceps bigger than my thighs,” he added.
https://www.vibe.com/news/entertainment/president-biden-ll-cool-j-name-boy-black-caucus-1234793801/