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.

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".

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

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