I use it from time-to-time. Doesn't matter what race the person is though. I usually use it when someone tries to run me and my bike off the road. There was this big white boertjie in a 4x4 with his whole family with him that tried that the other day. Look up the meaning of the word in the dictionary.
The worst swearword I can think of is "bru". I want to stab people in the face when they call me that!
I do swear rather profusely. heck, it sets my mood , a good explosion of swear words always gets me back on my jovial high horse. But I guess I could be described as capricious when it comes to my application of words, I guess it depends on my mood. I even decided to swear in an English oral to see what would happen, mind you it was funny the when the "oh no he didn't" landed and knocked my teacher off her chair.