When I lived in Sheffield, I had a Jamaican neighbour. My other neighbour was a Muslim. He wouldn't even look at the Jamaican man, let alone speak to him.
One day, the Jamaican was in his front garden and I stopped to talk to him.
As we were stood there, minding our own business, a twenty-something Muslim walked past and shouted to the Jamaican, "Get back in the sewer where you belong, you black bstd!" To his dismay, and what he didn't know was that my Jamaican neighbour was a carpenter and he had a machete in his hand at the time, as he was cutting down some long grass. He ran after the Muslim, waving the weapon and shouting, until the Muslim was out of sight.
I hope the Muslim had to change his underwear when he got home.
As for slavery, you only have to look at how Muslim women are treated by their own men to answer that!