It is not racist to question aspects of other cultures if they are incompatible with the established culture of the UK.
We live in a country where free speech is allowed, so if people want to blindly celebrate multiculturalism they have every right to do so. I, however, have no wish to celebrate FGM, Breast Ironing, Honour Killing, Forced Marriage, Voter Fraud, Child Sexual Exploitation, Spitting in the street, Fly-tipping and littering, all of which seem to be acceptable in some cultures. While the PC zealots continue to try and suppress discussion of these issues they will never be eliminated.