I do know plenty of people who think this way, and I find the post quite plausible. There’s been so much disinformation about unions in the US, for the last couple generations, that people don’t know any better.

However as an edge case, I do believe it was true for my brother working part time minimum wage. As far as we could tell there were no benefits for the part timers, no extra pay, no protections, no perks, just extra dues to pay. It’s too bad too, this could have been the unions chance to re-educate, show them benefits when someone is starting out so they support unions the rest of their lives. Instead it reinforced his prior attitude and he remains anti-union to this day