If you'd like to target a specific demographic you can do so using either inclusionary or exclusionary targeting. Only one of those systems also allows you to explicitly exclude one or more groups rather than just target a subset of groups. Your example seems to be a very charitable interpretation of how exclusionary targeting could be used. There's (probably) nothing wrong with it if it's used that way. But you could just as easily use the system you described to prevent a variety of protected demographics from being able to see the advertisement whatsoever.
