I always wonder why people say “It’s not racism, it’s just ignorance!”  Why can’t people be both stupid and racist?  Here are a couple of examples:

In a crossword puzzle for 5th graders:  17 across:  An insulting way to label a black person.   
Yes, the answer really is the n-word.

The Mac Haik Ford Lincoln Mercury dealership ad:  Tired of the Wet Backs?