I've just read through this thread and will make a few comments:
I am surprised that no-one has mentioned the fact that a few days ago three white people were murdered by a Libyan terrorist, and a lot more were injured. All were white. Was it a racist attack or just coincidence?
A few years a go I went to get some specialist work done to a satellite system. It was in Birmingham. Other than the staff at the centre I saw no white people in the few hours I was there. I went to a shop to get a newspaper and I was laughed at for requesting an English language newspaper. I felt uneasy and was completely at odds in the area.
The proprietor at the centre told me that he no longer takes work on a Friday because he's close to a mosque and people's cars completely black the entrance to his workshop. He made it clear that the locals want him out of the area so that they can expand the mosque. It was racism but turned on its head
If black people feel as uneasy as I did when in predominantly white areas they have my complete sympathy.