In the End of Time, Part Two when David Tennant (the 10th Doctor) regenerated into Matt Smith (the 11th) he says to himself:

I’ve still got legs. Arms, hands, lots of fingers, eyes, hair…I’m not a girl. I’m still not ginger.

This episode seen by 11 million viewers caused angry parents to call in and complain to the BBC that the comment would encourage the bullying of their ginger haired children. While reading the statement doesn’t really sound as it was not meant as in insult it was actually a statement of disappointment. Despite this the BBC was forced to issue a statement:

We would like to reassure viewers that Doctor Who doesn’t have an anti ginger agenda whatsoever. This was a reprise of the line in the Christmas Invasion episode in 2005, when David Tennant discovers that he’s not ginger, and here he is, missing out again – disappointed he’s still not ginger.

They note that the Doctor has had a desire to have red hair nad have been a running joke since episode titled “The Christmas Invasion” in 2005.