More seriously, more people should be concerned about the Conservative party's disdain for the Human Rights Act and suggested intention to withdraw from the European Convention on Human Rights: https://www.theguardian.com/law/human-rights-act
(So you'll see the UK does have a list of rights, but like everything else it's a normal law that can be changed by Parliament in the usual way -- there's no special constitutional law requiring more effort to change, and/or a special court to uphold it.)
That is simply not the case in the US, where, in fact, a right wing populist did come to power, did try to subvert the election process, did try to (indirectly) eliminate congress, and failed on every front. And he failed so hard that people might re-elect him since they don't think he could succeed the second time around anyway. Yes, people shoot each other all the time, the violent crime rate per capita is incredibly high, and society in general is plagued by inequality and racial tension. But the chaos drives the country forward. The UK is quiet, calm, comfortable (workers schedule their strikes!) There is no room for real organized dissent. It would take the dissolution of the monarchy for real change to come about, but they aren't going to do that here. They aren't going to do anything.
However, down is not the only direction. The nation has been far more authoritarian in the past; we will be more liberal again in the future. Liberalism is not a spent force, and there is a sizeable constituency which values personal privacy.
I have not heard any British person say the Queen was chosen by God.
I THINK people may have been talking about the value (or not) of written constitutional guarantees.
In Blighty, sarcasm and piss taking are part of entry level conversation. I kindly suggest this is something you clearly missed when 'arguing with British people'.
(The American habit of writing "/s" to signal sarcasm looks distinctly odd to a Brit, as of course it is sarcasm, otherwise they would not have written something so obvious.)