Your obviously aiming at the 'little englander' trope fanjo
It's seen as shameful or politically divisive to disseminate things such as the rule of law, personal freedom, free markets, etiquette/manners, (real) tolerance, Iron Maiden etc.
The majority of this country's population have a pretty well defined value set in terms of key points - Democracy, rule of law, personal freedom etc.
This is what people are talking about when they say British values, not whether you use words in a certain way or who your favourite rock band is.
These are the fundamental bedrocks of our society.
If we all held the same total values, we would dress, talk and do the same. Just because someone likes Boden or iron maiden and I don't doesn't mean we don't share key values, just because someone from the north says tea and I say dinner doesn't mean it either.
I have no idea what the agenda is of people who try to say there are no defining values of people within this country because we all don't believe everything that everyone else does.
But on the same vein that doesn't mean we should wilfully ignore certain inconsistencies or use broad brush statements on anyone.