Good thing they aren't making fun of crippled marines then right? The joke was about someone with metal hands trying to fight in the UFC and you are just twisting it to be about something else.
Current issues are the number one source for comedy and you can't expect people to sensor themselves because it may offend someone.
Either everything is okay to make fun of or nothing is. There is no grey area in censorship.
The opening line "Ex-Marine, Nick... who lost both of his hands in Iraq". Maybe you should watch it again.
Making jokes about current issues is one thing... this is quite another. you're right, there is no grey area... this falls under the outright wrong. If it was just "someone with metal hands trying to fight in the UFC" fine.