how would words not work in democracies because of institutions, maybe, if you go Derridean, you can be like well using those terms assume an undesired baggage, or if you go Deleuze like, you'd be saying something along the lines of the concept is not actionable in our current world, but this is just nonsense. Plus marxist jargon is often the same as classical economists or other theorists, and freedom is literally the basis of Marxism, please ask him if he thinks that Tsarist russia didn't have a "dialectical culture" and how well he thinks free speech and dialectical discussion worked in Afghanistan!