First, it's "niggardly". It's also worth pointing out that a lot of people learn the word "niggardly" and procede to use it solely to see if it offends someone.
You're right, and it's fixed. Thanks for the spelling correction.
For purely practical reasons, I don't think it's a good idea to go around saying "niggardly", and I acknowledge that some people use it in order to offend. The point I intended to imply was simply that it was PC overcorrection when they fired the guy (I don't believe he was trying to offend, but my memory's not perfect.)