I think Betsy DeVos is a very wealthy woman who has no idea what she's talking about, so cutting her off every time she speaks is a practical way to shut her up... Kamala Harris is a very astute politician, with a great diversity of knowledge, and as such, has presence when speaking... Interrupting such a speaker is done only to quieten her points, and such behavior is plain rude... This may come across as bias to some, but if we are honest, this is the reason for the disparity in judgement.