I didn't say it was a #1 value "above all", I said it was one of the basic ones, i.e. it lies at the basis of Canadian (and actually western) values, i.e. "beneath" them, as an assumption that unerlies the others.

Cultures that do not accept it, go on to build their societies accordingly, to ensure women cannot interact with unrelated men in public space. From that follows gender segregation, the face veil, the denial of women's right to drive or go out without a male guardian, etc.

Canadian values aren't defined as something ALL Canadians share, finding any value everyone shares is indeed impossible, particularly after we have already invited in some people who do not, but that is precisely the issue. There will always be some marginal dissenters. Are you suggesting this is not a widely shared value almost all Canadians agree on, and actually act upon? In fact, something so basic, people are surprised when someone  actually points it out?