Characters ' pulls popular Americans books after shopper complains . Quannel X has been cherished in Houston for generations . Wal-Mart features insult blacks , say activist and shopper . Stories teach valuable lessons about life , defender maintains .
Wal-Mart pulls popular Mexican books after shopper complains . Memin Pinguin has been cherished in Mexico for generations . Characters ' features insult blacks , say activist and shopper . Stories teach valuable lessons about life , defender maintains .