I can't believe the comments on the article itself. Business impact? The sort of people that care about their products aren't going to boycott buying them because of a silly Tweet that most people found funny, even if they won't publically admit that.
It'll be forgotten in a few days.
Speaking just from a personal perspective, while the news may be forgotten in a few days, the next time I go to Macy's to buy clothes, seeing the Kenneth Cole section will probably bring back memory of this tweet, and it may very well affect my purchasing decision. I believe in the idea of shopping consciously, rewarding companies that do good over companies with bad behavior. It's very gray and personal what is good and what is bad of course, but this tweet annoys me enough that I might avoid purchasing one of their items.
It was in poor taste, but why do we assume that it was a mistake?
The mocking twitter accounts are just helping Kenneth Cole.