My best friend is obsessed with race

First, a bit of context: I'm black (but british born, as are my parents) and my best friend is white.
The problem is that whenever I happen to mention to her that I like somebody, her first question is 'Okay, but what race are they?'. Then she makes weird comments like 'Oh, I can only see you with black guys' and 'Yeah, I really can't imagine you ever dating a white guy'. I don't understand why race is such a major factor in the people I like and date. I date people I like, regardless of race.
She's known for saying things like 'Oh, I would date a black guy, but I definitely wouldn't marry one. I don't think they're marryable'.
The other day, we were having a discussion about the world cup. I was saying that it was funny that england were out so early and she retaliated by saying that 'it's only because the people in the other, poorer countries have nothing else to do'. When I asked her what she meant, she said that she was talking about the fact that in Africa, they're all poor so they have nothing else to do but to fetch water and play football. When I tried to explain to her that, no, a lot of people in Africa AREN'T poor and the majority have proper jobs, cars and houses, she brushed me off. This is somebody that has never been to Africa in her life.
She also makes rather ignorant comments. The other day, she said to my friend who is south asian that 'it must be nice to not worry about dating, as your parents are arranging a marriage for you'. My south asian friend was rather offended, as she has never said anything about having an arranged marriage to my best friend (and she's not).
She calls East Asian people 'weird'. I am an avid fan of korean music. When I asked her if her boyfriend listened to korean music, she said: 'no, because he's white. White people don't listen to that weird music'.

What the hell is wrong with her? I've only just started noticing, so these are the most recent examples, but it's been an ongoing problem throughout our friendship (almost 7 years now).

First, a bit of context: I'm black (but british born, as are my parents) and my best friend is white.
The problem is that whenever I happen to mention to her that I like somebody, her first question is 'Okay, but what race are they?'. Then she makes weird comments like 'Oh, I can only see you with black guys' and 'Yeah, I really can't imagine you ever dating a white guy'. I don't understand why race is such a major factor in the people I like and date. I date people I like, regardless of race.
She's known for saying things like 'Oh, I would date a black guy, but I definitely wouldn't marry one. I don't think they're marryable'.
The other day, we were having a discussion about the world cup. I was saying that it was funny that england were out so early and she retaliated by saying that 'it's only because the people in the other, poorer countries have nothing else to do'. When I asked her what she meant, she said that she was talking about the fact that in Africa, they're all poor so they have nothing else to do but to fetch water and play football. When I tried to explain to her that, no, a lot of people in Africa AREN'T poor and the majority have proper jobs, cars and houses, she brushed me off. This is somebody that has never been to Africa in her life.
She also makes rather ignorant comments. The other day, she said to my friend who is south asian that 'it must be nice to not worry about dating, as your parents are arranging a marriage for you'. My south asian friend was rather offended, as she has never said anything about having an arranged marriage to my best friend (and she's not).
She calls East Asian people 'weird'. I am an avid fan of korean music. When I asked her if her boyfriend listened to korean music, she said: 'no, because he's white. White people don't listen to that weird music'.

What the hell is wrong with her? I've only just started noticing, so these are the most recent examples, but it's been an ongoing problem throughout our friendship (almost 7 years now).

damn. do people like this exist in 2014

Is she for real lol? How can someone be that ignorant?