He didnt have any Reddi Whip for a Whip cream challenge.
As with all narcissists, when you challenge their carefully constructed image of themselves, and point out truths, they unravel and become belligerent, combative, and often viciously respond.
The Trump Presidency has made it clear that DC (and particularly the Democrats) is filled with incompetence, and that we truly would be better off without a political class. He is an existential threat to their egos, and that, more than anything is why they hate him.
Biden’s response exemplifies this.
It's time for a total revamp of American government, and of the political bureaucracy - which is full of the same kind of delusional and arrogant narcissists who look down on the rest of us - from their perch of delusional ignorance.