Brand of clothing that is popular among high school jocks, college frat kids and other unpretentious people.
Hipsters and emo fans hate it because the conformity and perceived airheaded-ness of Abercrombie shoppers reminds them of what they try to avoid becoming, but end up as anyway.
Abercrombie and Fitch is apart of a form of clothing style that is sucessful because it doesn't completely revolve around a music genre, thus causing all the scene kiddies to revile this type of clothing.
Abercrombie shoppers may not be the most original or stylish people in the world, but neither are you.
Note: I don't wear Abercrombie; I just find that bashing people's preference in clothing to be shallow and petty. Wear what you want.