As usual, CSG has his anti-union talking points down pat. He might as well be a professional- maybe he is.
The first thing, of course, is to appeal to vanity, accuse union proponents of being "weak", of not being able to stand up to their mega-corp employer on their own. It's true, of course, that's why unions exist, so that workers can gain the strength to negotiate successfully. Yep, we're weak when we're alone- that hasn't changed, and, uhh, so what?
The next thing is claiming that employment is voluntary, when it's not, at all. Employment is a necessity, and the vast majority of jobs are working for somebody else, often the aforementioned mega-corps. It's capitalism, remember? If you don't have any, capital that is, then you work for somebody else.
And there's always the usual rightwing schtick about "efficiency", about how unions introduce inefficiencies into the marketplace. That's true. The whole middle class is terribly inefficient. In a perfect Capitalist utopia, the top .001% would be unbelievably wealthy and the rest would have just enough to make it to work most days... well, when their services were required, anyway... which has become rarer as the sources of wealth, labor, have been shifted offshore. Capitalism doesn't need us, except as consumers and borrowers, chained to whatever jobs they offer at whatever terms they dictate. So let's just get it over with, banish unions, move to the endgame, shall we?