I'm suprised about most of Vietnamese people's opinion against Zelensky and Ukraine

Vietnam was recently out of 3 wars against strong invasions forces: French, America (in which my dad lost an arm) and China. So I think people should sympathize with the spirit of patriotism and territorial integrity of Ukraine and president Zelensky more than against. But I was so wrong. Comming to Facebook today, after the shouting between him and Trump, I found almost all comments calling him stupid, weak, ungrateful, etc and wishing "Emperor Putin" soon can take over the whole country.

I was so surprised, and to be honest I cannot wrap my head around to find any argument to validate their opninion against the smaller country trying to defend their land, their rightful territory with whatever they have against Trump's clear attempt to sell Ukraine to Putin for some stuffs underground.

So can anyone explain to me why most Vietnamese people seems to prefer the invading force in this situation?