Rangel condemned Biden's latest display of his notorious stupidity in a radio interview with The Perez Notes. It shows up at about 1:37 on the video.
According to Rangel:
"Was he talking about slavery? You bet your ass he was," Rangel said. "Was he using the vernacular? Yes, he was. Did he think it was cute? Yes, he did. Was it something stupid to say? You bet your life it was stupid."
"It's something that if a black had said it, we would have been laughing because we would know that deep down they may be beating the hell out of us but they ain't thinking of putting us in chains," Rangel continued.