The reason its called “Black friday” because in Accounting Terms losing money is called being in the “red” and making money is called being in the “black”
Most retail stores lose money most of the year and make money the day after Thanksgiving.
If “Black Friday” was such an unjewish idea why does B & H Photo (Largest Charedi owned store) have black friday specials and if shopping is December is non-jewish, Why does Eichlers have Chanuka Specials.