A little context wouldn't have gone amiss. Where did TM say Bernard Manning was a 'fat white *******'? Was it the ITN news? Was it a serious, current affairs programme?
Er... no it wasn't.
It was on a satirical news programme called 'News Knight'. TM introduced an item titled: "Racist and Dead." "This week it's fat, narrow-minded comic Bernard Manning. I never thought he was a racist. I just thought he was a fat white *******."
Regardless of whether you think it was funny or not, it is clearly satirising Manning's oft repeated point about his racism just being a joke.
Can I just suggest you never, never, never watch the Brass Eye paedophilia special, because if you didn't get this, you're really going to miss the point of that.