Yes, these are all arguments you might be able to use to varying degrees of success to defend yourself against a discrimination lawsuit, but that's a lot more h

Yes, these are all arguments you might be able to use to varying degrees of success to defend yourself against a discrimination lawsuit, but that's a lot more hassle to deal with than if said lawsuits are already just invalid on their face because discrimination is legal generally except for a few specific kinds. Also I'm not as optimistic as you are that some of these defenses would work.