This is really interesting:

The U.S. television network ABC recently staged a scenario in which an actor worked in a bakery in Texas and refused to serve an actress dressed as a Muslim woman in a headscarf. The scene was an experiment to see if other customers would help the Muslim woman.

Thirteen customers defended her by yelling at the clerk, asking for the manager or walking out in disgust. Six customers supported the bigoted clerk and 22 looked away and did absolutely nothing.

The rest of the article is interesting as well.