All advertisers have a target. It may be based lifestyle, culture, ethnicity, age, gender and more, but advertisers know who does and does not use their service or product.But I'm arguing that reaching a mass audience, many of whose members could care less about the advertiser and buying the product(s) being sold, is no longer the goal of many advertisers, especially national advertisers.
Usually, advertisers decide where the sweet spot is. That means where every dollar in advertising produces greater income than expense. Even if they sell in other areas, the profit is not enough to merit targeting there.
Even very broadly consumed products, like Coca Cola, know where the most important segments are and they target them more intensely.