You don’t know many working class Americans or you could ask them. I do and have and they report exploitation and misaligned incentives. Unions are like corporations, they can have poor leadership with goals that are incongruous with the goals of the members. Union dues can feel like you pay a lot of your hard earned cash to just have your money siphoned off to a politicians that literally hate you. But usually they have agreed that in general it’s good that unions exist. Better to have them around than to not have them, in the abstract.