That isn't even comparable. Repeat to yourself three times what everyone else has been pointing out: Multiculturalism is a fact of globalisation, and any multicultural policy is merely in support of the diversity that already exists.
Anti-multiculturalists are really just anti-immigration, but to dress this up a bit more nicely they resort to creating strawmen depictions of multiculturalism (e.g. as being tolerant of extremism) that they attack to prove an ill-defined point. I dunno, using big words makes you sound better, I guess.