The thing that is unacceptable is the Russian invasion of Ukraine. Nothing about Ukraine trying to push the invaders out of it's own country in any means they can is unacceptable. The memes and jokes in media are trying to turn something extremely grim into something a little more lighthearted to release stress. Otherwise people would lose their minds amidst all the tortures, mass murders of civilians and other activities being performed upon Ukrainian civilians by the Russian invaders.
And yes, social media being heavily involved would be something unimaginable 10 years ago, because the proliferation of cell phones has now reached much of the world, giving us direct access to the horrors of war.
And no, the worst war propaganda comes from Russia where they literally advocate for the elimination of Ukrainian civilians among other atrocities.