They call them ethical standards, and if you’re being reduced to a purely semantic argument, why not just pack it in?
If the same association, in the fifties, excluded black members, would you say that the standards they were enforcing at the time were ethical?
Which is obnoxious.
Maybe I _am_ splitting it a bit too finely, but I just don't see ethical norms (which do change over time) as something being enforceable.