Perhaps you might enlighten us all.
The term multiculturalism has a range of meanings within the contexts of sociology, political philosophy, and colloquial use. In sociology and in everyday usage, it is a synonym for "ethnic pluralism", with the two terms often used interchangeably, and for cultural pluralism in which various ethnic and cultural groups exist in a single society.
Collins Definition
Multiculturalism is a situation in which all the different cultural or racial groups in a society have equal rights and opportunities, and none is ignored or regarded as unimportant.
OED Definition
As a descriptive term, multiculturalism refers to the coexistence of people with many cultural identities in a common state, society, or community.
I would be incredibly surprised if any of the people you've argued with in this thread recognise or accept the definition of multiculturalism you posted.
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