I doubt Biden knows why he's not supposed to like her. The key is that Kamala called him a racist when both were presidential candidates. Jill hasn't forgotten. She's the one who hates the Kommie.
I think what's going on between Jill and Kamala is deeper than the debate insult ---- it's a shift in a historic paradigm and Jill is not adjusting well to it.
Jill's watched how the WH game is played for decades and she's craved being First Lady of the United States Jill's watched from the sidelnes how durng WH events all eyes and cameras are on one woman : FLOTUS. This is no longer the case. Jill's competing with the first woman Vce President, of some sort of color and 14 years younger.
I don't think Jill's trying to elevate herself to VP status, I think she's trying to demote Kamala to Second Lady status ---- and Kamala being an incompetent lightweight lacking even a hint of gravitas makes it easy. This is the underbelly of the woman's movement MSNBCNN won't talk about.
Positoning is everything ..... here at the inauguration, as at the funeral, Jill should have been on the other side of Joe:
