'Multiculturalism' is a much abused word. Broadly, when used as a pejorative by those of the Daily Mail tendency, usually in phrases such as "the failed experiment in multiculturalism" which means "I don't like wogs". When used enthusiastically by the loony left in phrases such as "Celebrating multiculturalism", it means "White people are evil". The dictionary definition is "the policy of maintaining a diversity of ethnic cultures within a community". In practice, it's often for or against "the muslims".
Maybe it could be a libertarian idea? I like the fact that Britain is home to people whose family origins are all over our formerly vast empire. People liked the mother country sufficiently to settle here, and despite New Labour's best efforts, this country remains a better place to live than Somalia, Afghanistan or France. This is good. Now as a libertarian, I couldn't give a tinker's cuss about what people say, do, or think, so long as they leave me and my friends alone, and refrain from sponging off my taxes, so I enthusiastically endorse the dictionary definition of multiculturalism. The point of libertarianism is that individuals should be free to live as they choose, with the above caveats. And as most people display "in-group preference", there is a tendency for ethnic and cultural groups to concentrate into discreete areas of towns. Jews in Golders Green, Bangladeshis in Whitechapel and dick-heads in Hoxton, using London as an example. So long as this is not enforced either legally or informally in any serious way, this is just natural. A side effect of such assortive residency leads naturally to the easier maintenance of cultural norms such as ringlets, beards or stupid, identical haircuts with a spiky hairspray mohecan and a job in
"media" a mobile phone shop - and bingo!: Different areas have recognisably different people in them. We're "Multicultural".
Consider this, when you start using the word "multicultural": Are you actually disapproving of the actions and culture of people you don't know, facing different challenges and problems to you, about whom you know little? Are you hoping that "multiculturalism" might act as a wedge, to change the country you live in to one you might approve of (but probably won't)? Or does "multiculturalism" mean "live, and let live"? If so, Amen! Right on, brother, we're onto something.