The article was prompted by the alleged abuse of a red headed family from Newcastle, England, which resulted in them having to move house.
From BBC News:
Here's a joke. "What's the difference between a terrorist and a redhead?"Read more
Here's the punchline. "You can negotiate with a terrorist."
Is this offensive? If it was made in your workplace, within hearing of a redheaded colleague, would you make a fuss? Probably not.
But mock someone's ethnicity, religion or sexuality and you will attract the beady eye of management. Make a sexist joke and prepare to be dismissed as an antediluvian relic.