[mulmen]

Advertising has always been discriminatory. Even in the 90s there were multiple billboards, newspapers, magazines, TV and radio stations in the world. Advertisers select what, when and where to advertise based on who they think is listening.

The only thing that has changed is how much we know about the "listener" (or page viewer). The nature of advertising is no different today than it was 100 years ago, only the resolution changed.

[Mirioron]

I don't see how you could even have ads that aren't discriminatory if "proxy characteristics that correlate with age or gender" is enough to be discriminatory? If you put an ad next to a barbershop, then that ad is targeting men through "proxy characteristics that correlate with gender", because it's next to a service that men are much more likely to visit. Is that illegal discrimination too? Are there officials that somehow calculate the locations where you are allowed to put advertising so that it wouldn't discriminate (close enough to shops that both men and women visit)?