And your point is?

The professor said the Mayor of London, Sadiq Khan, was a Pakistani, the only reason he could have come to that conclusion was the colour of the mans skin as Sadiq Khan describes himself as a Londoner.

It was a clear case of racism, judging a man merely by his appearance.

It was racism when he first posted it and it is still racism now. The only difference is he's managed to embroil you into the discussion.