Earlier quoted context omitted.
I think it has to be framed against the baseline of pervasive anti-union ideology in the US. When people have been inculcated all their lives with the idea that labor organizing is bad, they’re all just temporarily embarrassed corporate execs, it doesn’t take too much to push them back towards this baseline. Or at least enough to quash the union.
I’ve spent 30 years in the US, many of those in red states, and I’ve heard the “temporarily embarrassed millionaire” canard way more often than I’ve heard anti-union rhetoric. In fact, I’m not sure I’ve ever heard anti- (private sector) union rhetoric. Have you considered that maybe peoples’ reactions are based on bad experiences with unions? In particular, public sector unions. Even liberal areas are pretty anti-uni…
I envy you such selective hearing. You could check out any discussion about the strike against General Motors that's taking place right now and find samplings of both pro- and anti-union rhetoric for comparison, but I wouldn't want you to put your exquisitely tuned eardrums at risk.