I was just pointing it out. I'm not really offended by it but I do agree with many that the words "niggardly" and "niggle" would preferably not be used where other words suffice. Otherwise you end up in silly conversations like this one.
And Buffie has nothing to do with anything and isn't really a valid analogy though I appreciate the humor here. If you can show me actual usage of those words in the way you describe, then yeah I'd avoid those too. Again, go ahead and use them if you want.