It's just a joke, right? Consider my thoughts on the matter, then explain to me how being "politically correct" is a bad thing.
What people have come to think of as "political correctness is not just about someones feelings, it's much deeper than that.
Consider the way tv commercials work. Everyone knows commercials play on our subconscious with subliminal messages, repetition and planting ideas for our minds to digest into the desired result. It works or they would not pour big money into having psychologists and marketers come up with ways to encourage us to purchase a product we otherwise would not.
Notice the frequent use of humor in tv commercials, it's not just because they want to make us laugh, they want us to buy their product. Everyone thinks it works on everyone else, but "not me, I would never fall for it", as sales go up after a crafty marketing ploy that targets our subconscious. This is real proven science.
Now consider one of the aspects of political correctness, jokes aimed at women and minorities. This plays on our subconscious as well. When we laugh or find humor in something we get a rush of chemicals that makes us feel good. This is positive reinforcement causing us to subconsciously believe the context of the joke or statement to be a good thing, since it makes us feel good.
If we consistently hear negative humor directed at women and minorities it encourages us to see the point of the joke as being valid in the sense of us being superior to the other. The more we hear it(repetition) the stronger the feeling of superiority.
Jokes and humor can be a strong influence whether we realize it or not. What seems at face value to be a harmless joke may in fact not be harmless at all..
It's not just that it may hurt someones feelings although that should be a consideration, the problem is that it promotes emotions and feelings that foster real inequality.
I like jokes too, funny is funny, it took me a long time to realize their impact, but when the brunt of the joke promotes inequality, it's not funny. I try to avoid such and would recommend that you do too. We can break this relentless cycle, but it will take a generation of not being exposed to the false negative notions that reinforces feelings that foster racial inequality.