Fascist humor is just the first thing any teenage mind would think of to make their teenage friends giggle. It usually just amounts to calling someone a derogatory name. And, just like a teenager, they get pissed when it’s echoed back at them. They are, literally, mentally retarded.
The original phrasing to me made it sound like the survivors should be embarrassed to have used memes to defeat fascism. When the fascist are the ones that should be embarrassed