oh come'on.. it has been discussed 1000 times..
it's not about being racist. It's about who you/they want to live with.
If you had extra room at your house, I think you also would select who your housemate will be, right?
...but hey, my neighbour recently was looking for the house mate, and he is a middle eastern arab.. do you want me to ask him whether the room is still available?

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“You become responsible forever for what you have tamed”. Antoine de Saint-Exupéry