there's no real context to this it's just a crank being a crank but here if you wanna see the leadup: 
They always almost get it, like they will outline an overview of dialectical materialism, that things have causes and effect and everything is influenced by other things, then just say the most nonsensical shit like "Marx didn't mention that your shoes will smell like lemons if you put lemons in them, therefore he had no idea what he was talking about with economics."