I agree with you, but I'm trying to accept the framing from the comment above to get them to see the benefits of unions even if they cannot be disabused of the idea that existing pay is meritocratic.
Unions help level racial and gender pay gaps. The framing that this is because high skilled workers are compensating low skilled workers, that the current situation is meritocratic and white men are naturally superior, is implicitly white supremacist and misogynist. We didn't push back on this, because we tried to find common ground with the other side who never had anyone or any social obstacle challenge this framing of natural hierarchies. However, the consequence now is that fascism is mainstream and part of the government, which thinks DEI is about hiring low quality people.