Yes, Muliti-culturalism is an anti-concept. The term it seeks to displace is Cosmopolitan.
Multi-culturalism does this by obscuring three of its own aspects that are required to judge it as evil. First, as Jean-Francois Revel points out, Multi-culturalists assert that all cultures are morally equal except for Western (Enlightenment) Culture, which it denigrates as Evil.1,2 Secondly, it elevates Moral Tolerance to the status of a primary virtue which short circuits the evaluation of those "morally equal" cultures. Third, it assumes that Determinism, whether cultural, economic, racial, social, tribal or some melange of them, conditions the thoughts, character, actions and thus the life of the person. This third aspect is philosophically primary, but it is the one that the multiculturalists hope most to obfuscate, preferring to speak in pseudo-enlightenment terms like "Multicultural Individual" or "Open to Other Cultures," while pursuing a collectivist political agenda hostile to actual individuals and Western Culture.
Cosmopolitan refers to an individual who retains cultural roots in his or her country of origin, yet has adopted a wide taste for other cultures, and so lives both a "local" and "global" life. The term is derived from Greek cosmos, the global, and polis, the old Greek city-states (the local).
For those of us in the West this means retaining our cultural roots in the Enlightenment, Judging other cultures by appropriate standards and Choosing from among them the best they have to offer. Precisely the opposite of the program that Multi-culturalism proffers.
1"Whence comes this fierce hatred of the intellectuals for the least barbaric societies of human history, and this rage to destroy the only civilizations to date that have emphatically conferred a dominant role on intelligence?"
2 I originally used the term "Uniquely Evil," which succintly describes the Left's evaluation of Western Civilization. I have since discovered that White Supremacists and Bio-Ethic Conservatives have co-opted the phrase in their reaction to it; one person who rails against the Left's use of the term proposes an "Ethnic Basis for Individualism."
I propose that the concept, "catholic"/"catholicism" is the proper one when "multiculturalism" is used in an innocent way. "Catholic" means "Universal or general, affecting mankind as a whole, or affecting what is universal in human interest. 2. Comprehensive in sympathies or understanding, liberal, as in "catholic" taste." Webster's Collegiate, Fifth Ed.
It is the virtue of catholicism that is being urged, I believe, those times the term multiculturalism is acceptably (if mis-guidedly) used. The concept catholic abstracts the norm of human affairs, the essence of humanism, from the specific, provincial dressing it appears in. It ignores everything that is different but insignificant between peoples and cultures. It does so without giving up the possibility of judging right from wrong.
The term, multiculturalism, implies that moral distinctions made in a context of cultural ones are thereby, automatically, irrational. It assumes that even reasonable men cannot abstract from the window-dressing of different lands and peoples to what is morally significant. We can't separate the wheat from the chaff, it posits. Notice that a specific complaint against a specific judgment could be argued. But the purpose of the coinage is to preclude such, (doomed) arguments.
The power of the term is that the fact of different cultures is obvious. The literal meaning of "multi"-"cultural" applies. This appears, to the uncritical, to validate the meaning of the statements which use the term. Their meaning, however, actually is that specifically moral differentiations are false.
(Logically, this also implies that there are no specifically moral judgments. There are only differences. All differences are cultural and incidental. Being acquainted with them, "understanding" them is urged in the place of evaluating them.)
We can, I suggest, urge that all nations strive for catholicity in their practices and policies, and we can defend our principles as being catholic as well as moral. We can claim that American political precepts achieve the ideal of catholicity. There is nothing the most innocent and well-intentioned use of the term "multicultural" can ask beyond what that term asserts.