If he didn't speak to figures like Foucault, wouldn't detractors say he didn't even try to understand?
The criticisms on this forum have largely been answered in detail by Chomsky, for example in 1995: http://cscs.umich.edu/~crshalizi/chomsky-on-postmodernism.html
Amazingly, it seems the arguments changed little since a decade ago. For example, he pointed out, "But instead of trying to provide an answer to this simple requests, the response is cries of anger: to raise these questions shows 'elitism,' 'anti-intellectualism,' and other crimes"...
His nuanced views on Lacan back up Zizek's public view, which I quoted earlier: "Lacan (who I met several times and considered an amusing and perfectly self-conscious charlatan, though his earlier work, pre-cult, was sensible and I've discussed it in print)"
Tayssir