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That's not what he's saying. I don't know why you're misinterpreting it as a slight against carpenters. Writers are in the business of speech, carpenters aren't. That doesn't mean that carpenters can't stand up for free speech.
Maybe I'm reading it wrong. It just seemed an odd juxtaposition because (at least in the US), union carpenters actually undergo extensive and quite formalized training to learn their craft, complete with graded curriculum. It's a 4 year program as an apprentice. Maybe he should have said 'dishwasher' :)