Yes, the government's role in regulating commerce is stronger than freedom of association rights for people engaging in commerce.

i.e. you don't have to be friends with someone you don't like, but you can't deny them commerce (your labor) based on their being in a protected class.

That is, if for whatever reason you don't like people of a certain (Race | Age | Color | Religion/faith | Sex | National origin or ancestry | Disability | Genetic information | Citizenship | Veteran status) you cannot deny them business.

You can according to this ruling deny them business if the work is an act of expression you refuse to do.