Pretty much the same as Obama treated Biden when he was his VP! Ignored him.
It’s the president United States in his own house, shunned. Nobody would talk to him. So Biden wandered off, looking vacant as a crowd formed around a former president, Barack Obama, who was obviously deeply grateful for the attention. And then it got worse. It got much more poignant than that. Biden tried to horn in on the conversation swirling around Obama. Everyone involved in that conversation, including Kamala Harris, who supposedly works for Biden, ignored Biden completely. Biden desperately tried to get Obama’s attention. He puts his hand on Obama’s shoulder. He even calls him “Barack” like they’re friends, but Obama blows him off. He acts like Biden is not even there. Ask yourself if you have ever in your life, seen anything sadder than that?”