Honest answer?
they probably shouldn't be, but because the very fact they did it to camera rather demonstrates that they were joking. Whether that is in poor taste or not is of course open to debate. However, there is strong evidence that Gray and Keys actually ARE sexist, as opposed to making sexist jokes.

But basically it comes down to Sky wanting to sack those two and BBC not wanting to sack TG lot, I expect.
( the mighty badger Aphrodite, on a bar stool, by your side, Wed 2 Feb 2011, 10:09, 2 replies, latest was 15 years ago)

And if it went to air it's basically the editors responsibility.

(PsychoChomp, Wed 2 Feb 2011, 10:10, Reply)

indeed

( the mighty badger Aphrodite, on a bar stool, by your side, Wed 2 Feb 2011, 10:16, Reply)

editors directors
( JeffTheDogFucker Can you dig it?, Wed 2 Feb 2011, 10:17, Reply)

Right, I'm going on the News at Ten to tell a selection of my favourite 'paki jokes'
That'll be fine, right?
( Monty Boyce, My cheese game is strong, Wed 2 Feb 2011, 10:15, Reply)

Can you tell the nation some new ones?
We've all heard the classics.
( JeffTheDogFucker Can you dig it?, Wed 2 Feb 2011, 10:17, Reply)

I don't know.
I'm not in charge of television editing.
( the mighty badger Aphrodite, on a bar stool, by your side, Wed 2 Feb 2011, 10:18, Reply)