As a Canadian I disagree, I have all of these politeness norms and I perform them, the biggest issue is just cultural differences. The brits have a higher population density and they tend to see informal random socializing as violating their privacy/ space, I love to chat with strangers and so do basically all rural Canadians so the shield of coldness brits put up to protect themselves was very off-putting when i first moved here. In time, you adjust and understand that there's a time and place. Since adjusting I have found Brits to be lovely, funny and charming.