while i don't share chomsky's moral philosophy (i'm not a nihilist, and i'm not a relativist, but i don't place morality as having great importance. i don't reject it intellectually like the nihilists or relativists do, so much as i just don't think it matters, except, of course, when it does. so, there's an objective morality, but, most of the time, it should have little meaningful input on how you analyze situations, react to them or behave. other considerations besides objective morality are just more important.), i think he was essentially correct about his denunciation of foucault, who was really a totally worthless asshole of a person.
the most telling way to understand foucault is to look up his reaction to the iranian revolution. if you don't walk away from that convinced he was a burkean conservative, i don't know what to tell you.