This thread is quite interesting in that it demonstrates a certain dynamic of racism: the abolition of particularism and individuality to members of an 'othered' group.
The momentum of the thread has moved towards a presentation of (some) people's perceptions - even gripes - of 'Muslims' as some homogenous group.
What, indeed, has Sadik Khan to do with Rotherham? Yet such is the force of the internal propulsion of this particular racist dynamic that difference is abolished.
ironically, another facet of this propulsion towards the homogenisation (and stigmatisation) of othered groups is that it deals with clear, real examples of individuals and instances acting in ways that contradict the (stigmatised) notions of the behaviour/beliefs of the othered group by a discourse of 'exceptionsalism': "Well, SK may not be like that - but the others are," or "Well, SK may not say that - but just wait and see ..."
This results, almost inevitably, in a license to produce a quite slippery racist discourse: "Well, he's not like that - but the others do [insert whatever]" and on to the racism-by-association that we witnessed in Zac Goldsmith's campaign.
Don't forget, Zac Goldsmith was able to say that he had never said anything directly racist about SK himself, or accused him - directly - of being a radical. He didn't have to: the slidey momentum of this particular kind of discourse did a lot of the work for him.
I suppose I hope that one result of having an individual who is Muslim as Mayor is that it will push alternately; towards the possibility of fragmentation, particularity, and the witnessing of the mosaic of modern Muslim identity. I fear that a feature of SK's tenure will be how forceful this propulsion towards the homogonisation of the 'other' is.