"Perfectly normal when discussing Islam"

Talking about Douglas Murray, his latest Spectator article (a must-read) contains a telling passage regarding the BBC:

Of course, some people are willing to give up a few of our rights. There seems, as Rose says in his book on the Danish cartoons affair, The Tyranny of Silence, some presumption that a diverse society requires greater limitations on speech, whereas of course the more diverse the society, the more diverse you are going to have to see your speech be. It is not just cartoons, but a whole system of inquiry which is being shut down in the West by way of hard intimidation and soft claims of offence-taking. The result is that, in contemporary Europe, Islam receives not an undue amount of criticism but a free ride which is unfair to all other religions. The night after the Charlie Hebdo atrocities I was pre-recording a Radio 4 programme. My fellow discussant was a very nice Muslim man who works to ‘de-radicalise’ extremists. We agreed on nearly everything. But at some point he said that one reason Muslims shouldn’t react to such cartoons is that Mohammed never objected to critics. 

There may be some positive things to be said about Mohammed, but I thought this was pushing things too far and mentioned just one occasion when Mohammed didn’t welcome a critic. Asma bint Marwan was a female poetess who mocked the ‘Prophet’ and who, as a result, Mohammed had killed. It is in the texts. It is not a problem for me. But I can understand why it is a problem for decent Muslims. The moment I said this, my Muslim colleague went berserk. How dare I say this? I replied that it was in the Hadith and had a respectable chain of transmission (an important debate). He said it was a fabrication which he would not allow to stand. The upshot was that he refused to continue unless all mention of this was wiped from the recording. The BBC team agreed and I was left trying to find another way to express the same point. The broadcast had this ‘offensive’ fact left out. 

I cannot imagine another religious discussion where this would happen, but it is perfectly normal when discussing Islam.