Does anyone find it weird af to see Biden and Xi shaking hands?

Common courtesy. Trump did it too. You greet even your enemies because if dialogue ends - there is only force left.

Really if Pootin had gone,yes,no shaking hands,but an opportunity to say what you think about a given situation.

I do think its important to keep in good relations with even those that we may not agree with.
As Churchill said,"Jaw jaw,is better than war war".

Speak softly and carry a big stick, but speak softly till the other fucker goes deaf, then bonk the bastard.