And this is part of getting along in a civilized society, IMO. We all think a lot of things that would be offensive if spoken aloud. ANY marketing strategy is, by definition, exclusionary because no store/brand can (or wants to) cater to 100% of the population. Stores make decisions in terms of store layout, advertising, product content, sizing, etc. that are designed to attract certain people and deter others.
There has been a lot of discussion, for example, about how high end brands are often unhappy to be mentioned in rap lyrics because rap listeners are not - from their perception - their target audience. But even when this was obviously apparent, most companies tried very hard to avoid outright saying that, even when everyone knew it was true.
I guess the point is that we all have a feeling about which stores feel more like "us", and that isn't coincidental. It is carefully planned marketing. But every store needs to be careful about which demographic they choose to blatantly exclude ala statements like this one from A&F. As evidenced by this thread, it isn't necessarily the target demographic who will be offended by the statement, but instead it is often the parent or older-than-teenaged adult. And those adults often either hold the purse strings or do a lot of gift buying. In my eyes, A&F is risking alienating the demographic with the income to spend on school clothing, holiday gifts, etc. And while all other stores may feel the same way, NOT saying it will gain them more customers, IMO.