No. But he should be able to reject creating something that says “whites only” or “straights only”.

Example:

Denying a “white power” photo session - should be legal

Denying taking senior photos because the client is white - should not be legal

Denying professional headshots because the client is gay - should not be legal

Denying a “gay pride” photo session - should be legal (though you’re an asshole if you do it IMO)

But the thing is, don’t even give a reason. You don’t have to take every job, and you don’t have to say why. If you make the stand to not take a certain job because of political reasons, you are bringing negative attention on yourself

I don’t think you understood what I said.

The difference is in the business model.

If they’re working individual jobs on a freelance, case by case, contract-based model, then they can do whatever they want as far as signing a contract to do work or not signing a contract to do work with whomever they wish.

The reasons might be shitty sometimes, but that’s not enough of a reason to compel all freelancers to do work they don’t want to.