I had a similar experience to MrsTrebus in another part of the country but with mostly Somali men.
I don't think it's just fear of racism - I think it's also ingrained and often unconcious racism that a lot of professionals and a lot of society still hold.
That there is a particular 'type' of white girl/woman that 'likes' men of different minorities (more so with Afro-Carribean men ime) and those girls or women are viewed differently than white victims of white perpetrators.
In lots of areas where I live, judgement is still heaped on girls or women in inter-racial relationships.
And also by men and women of Carribean descent being horrified that their sibling/daughter is hanging about with 'Somalis'. I've heard Carribean families say 'well, they're different to us, they're Somali/Muslim. They're dirty/stupid and backward, they come from war zones so they don't have the morals/standards we do so you should expect to be abused if that's what what you choose. Not all Carribean families think that obviously but I've heard it a lot and heard it from some families of Black British girls being victims of Somali men.
I had a British Carribean drug addict tell me there are no more black dealers in his local area anymore, just Somali. They're black though I obviously said! No, they're not our black, they're Somali.
There have been Black British/Black Carribean and Somali gang/turf 'wars' in my city and Black British/Black Carribean girls who date Somali men are spat at, verbally or physically assaulted.