Is this true about the british people?

I have got a friend who is malaysian but she has got dark complexion because her father is black. she told me she been studied in england for a few years. at the school, she tried to make friend with everyone, including the white british boys and girls. but all of them seemed to not like other race in their group. once, she tried to make friend with some friendly white girl in a cl before the lunch time. she did aspect if the white girl would persuade her to have a lunch together, but after the conversation, the white girl said to her. "pardon, dear its time to have lunch I have to go with my friend bye bye..." another time she walked to the boy in the same cl and was trying to make friend with him but the boy shouted to her. "leave me alone!" so my poor friend doesn't want to make friend with british people since that time. she told me while she was studying in Britain. the only accepted into their group, were a people from middle east or the bi-racial. for example the lebanese, turkish, east indian or biracial black-white. all of these people were in the same group and went anywhere together all the time.