Surely 'the norm' is a loose set of moral standards that a society adopts to function together, outside of any government or law. He is right in saying they are largely unspoken. But they're not set in stone and are not defined by any relgion (when in a secular country). Importantly they evolve with the make up of that society so change over time. No one group of people can define what 'the norm' is or isn't. It's the general populance and their cultures that does that organically.
'The norm' my grandparents accepted was different to 'the norm' i experience. Their (post-war) 'norm' was the husband goes out to work and earn the money and the wife stays at home, raises the children and looks after the household. This is rarely the case now, the 'norm' has evolved and evolution is usually, if not always, a positive force.
'The norm' of my grandparents looked dimly at homosexuality, where as my parents 'norm' was starting to accept it. 'The norm' of my younger self had homosexuality accepted, on the whole, where as the contemporary 'norm' has it universaly accepted and any quarter that doesn't accept it are now on the outside of 'the norm'.
You can't just dig your heals in and try and grab hold of a 'norm' that suits you and your predjudices, it will just slip through your fingers like time itself. You can try and dam it but the pressure will just make your life harder and harder. It's much better to just accept the change and go with the flow. These far-right muppets just don't get that.