Liberals need to make up criticisms of Marxists in order to feel like they're part of the conversation. Nobody wants to firebomb a Walmart. That's adventurism and pointless. You made that up and assigned it to Marxists because you're anticommunist.
Marxists believe in organizing the working class to defeat the dictatorship of the bourgeoisie we all live under and are being oppressed by, not randomly attacking buildings. Reducing all of leftist theory to "lol they want to firebomb Walmart" is exactly the type of behavior we point to when we call liberal debate idealistic and not rooted in material reality.
Tl;dr youre a bunch of moronic liberals lashing out in incoherent ways. If you people actually studied Marxism, you could form much more pithy memes that actually offend leftists properly.