Just because you read something on a website doesn't make it true (especially if the website is trying to tell you that separatism and multiculturalism have the same goal). If you want to exclude people go do it on your own property.
Again, this is dealt with in the section you quoted. Multiculturalism strives for diversity, for cultural identity & group autonomy. But this is compromised with liberalism & becomes a doomed attempt. These cultures must function within liberal confines: a regime hell-bent on raising
consumers & a government unable to represent their values, as to do so would neglect and offend various other nations under their rule:
Multicultural societies do not allow for cultural diversity in the long run, for there must be significant compromise. Our new residents must adhere to the overriding dogma of liberal democracy that let them in, which effectively homogenises societies into tacky individualists following a culture that, unlike the low culture of the past, lacks continuity, ingenuity, and bases status on consumption rather than creation. After a few generations whatever culture is left will be commodified remnants; the 'richness' of multicultural societies has a lifespan. Multiculturalism is a great thing, but something that the world should host.
Nationalism strives for diversity, for cultural identity & group autonomy. Nationalists realise that throwing a plethora of nations into a single state & assuring them they can preserve their way of life is a serious threat at best. Is it surprising that the next generation adopt a fashionable use of symbolism that sheds the meaning but keeps the tokens moving? These societies are built on the idea that a country is a mere convenience through which the individual can make some money & pursue an inane 'lifestyle'. Vicious individualism is generally not the finest way to induce holism. Startling, I know.
It's sad that what you posted is nonsense and that you have no rebuttal other than to try to tell me what I believe and how I see the world.
If someone thinks what I posted is nonsense, then it is their job to rebut, not mine...