I wonder though whether they practice discrimination against others as fully as others discriminate against them. A minimal level of assimilation is protective.
They have their shops to support their own community's customs, dietary and otherwise. For example, Hasidic Jewish women wear wigs in public, because only their husbands are allowed to see their hair. So I would assume that a wig shop would be a thriving business in that community, as would a shop that sells the long frock coats and dark hats that the men wear.