Really, I don't have a problem with people wearing SFAM, A&F, etc.
I understand that most people are mentally overtaxed as it is, and only have so much time and energy to spend on clothes. If a person just wants to go to the mall, and spend an hour or two and a c-note to make themselves look a little more "fashionable", I really can't find fault with that. Reading about Japanese denim and ordering online from the few botique retailers in the US that carry them is time and energy that some people might think is better spent studying or honing marketable skills.
Cheap and/or easy is a perfectly understandable attitude towards clothing, In addition, I don't like people who judge a person's character based on their propensity to dress cheap and/or easy.
By the same token, I have no problem criticizing people for bad fashion choices that are neither cheap nor easy. Ed Hardy, for instance, where a person would have to go out of their way and spend an exorbitant amount of money to look like utter shit. At this point, I would have to question what character traits would compel a person to do such a thing.
This isn't about "style" as some cultivated, rarified sense. This is about ugly. Immediately apparent, slap-you-in-the face ugly.
I have no problem criticizing jeans like those-- not because they fail to be stylish, but because they fail not to be ugly. As well, I have no problem criticizing a person who would spend so much money on such ugly clothing.