Im gonna try to explain this in a nutshell...racism is like the ultimate verbal assault on a persons feelings because you're not only offending that person, but you're attacking that persons entire heritage - which goes a lot deeper than the person themself. Everybody has something that is sacred to them, something that they hold deep in their heart...for oppressed people, it's usually their heritige. I'm saying, people gave their lives for something as simple as wanting to be equal, to have the same rights, to be able to live and be treated like any human would want to be treated. When a racist steps on that line, they have gone too far. They are not only talking about an individual but everything that individual stands for, what their relatives fought their entire lives for and what a lot even sacrificed their lives for whether it was justifiable or not. A racists knows that if they want to verbally hurt someone beyond their feelings, that's how you get it done and - an oppressed person knows that as well.
It's no laughing matter, it's a mockery of an entire race and believe it or not, some will still give their life for what they believe in. There's no humor in that at all.