Your Company's “Casual” Dress Code Is Just as Bad

Don't necessarily disagree with the author's point, but the story seems to not really illustrate what he's trying to say.

Was he denied a job offer just based on his clothes? The way I understand the story the guy was pretty much saying: "man, don't feel obligated to wear slacks, nobody does, up to you". Was he told that wearing slacks was forbidden? Apparently he was explicitly told "Everyone wears what they want".