Why do gay people need glasses? They can't ever see straight!
What about that joke do you think is funny?
You're kind of getting on my nerves with this question.
Jokes are fun, but the punchline of your offensive statement attacks a group that has historically suffered and endured great victimizing. Hiding a hateful comment behind a joke only serves to cover up the underlying anger and motivating feelings are still there.
It's called a joke. I don't need to explain my jokes to robots.
While you might think that joke is funny, you should be careful who you say it to. Some people might find that joke to be offensive or hurtful, and you shouldn't want to make people upset.