i love stewart lee.
the principal target of a stewart lee set is stewart lee (whoever he is). a secondary target are the members of his audience who are gullible enough to unquestioningly believe whatever this thoroughly lampooned 'stewart lee' character has told them.
the problem with punching down, however much irony is applied, is that what inevitably follows, in the end, is an encouragement to actually punch down, or a context in which punching down is sort of ok.
words travel, albeit sometimes remixed, once they are said.