Sensitive to the touch

I went out to karaoke last night. That's exciting to me, because I rarely go out. I live in a little country ass town, in which I did not grow up. I have found it difficult to meet people, but I';m sure that's my fault. I think that I'm a nice person, but not a necessarily friendly person - if that makes any sense. I know this is true because last night, the (white) guy that was with us has only been living in this town since this past Sunday. Not even a week after his arrival, he is out with 3 black women!!!! So, I need to get out more.
I was a little uncomfortable last night. One of my Sorrors must have used the word NIGGA about 90 times last night!! Don't get me wrong... I don't have a problem with the word, but I would NEVER use it in the company of white folk. The one time that I did, by mistake, I decided to stop using the word all together. I figured that I must have been using it entirely too much, if I would make the mistake of using it in front of some white boy that I barely knew. Granted, I was talking to another black person at the time, but that was just over the top.
How do I know that homeboy won't get the impression that NIGGA is a cool word, mix it up in his vocabulary, and spit it out the next time he hangs out with us (or anyone for that matter). That is crazy. Am I over sensitive to this matter?