Full Idea
Just as liberalism precludes the establishment of an official religion, so too there cannot be official cultures that have preferred status.
Gist of Idea
Liberals must avoid an official culture, as well as an official religion
Source
Will Kymlicka (Contemporary Political Philosophy (2nd edn) [2002], 8.3)
Book Reference
Kymlicka,Will: 'Contemporary Political Philosophy (2nd ed)' [OUP 2002], p.344
A Reaction
This becomes tricky in schools, where the old way of teaching national literature and particular types of music has been eroded in modern times. But once wide diversity is allowed there is no single story which can be taught.