I disagree about the opinions things and British culture.
The UK is incredibly liberal. More so than the us.
Historical we accept a large range of opinions. What we want is cavets and explanations though. If we get those we tend to be able to live with different opinions.
What the British don't respond well to is 'because I say so' or 'because I'm right' without that why part. They want discussion.
Social media has tended to reduce arguments into increasingly black and white and less grey, but even then I do think the reason that we've become terf island is because of us desire to want to discuss and to challenge when we don't get an adequate explanation to what we are told.
I'm not sure Brexit would have happened in other places - not purely because we are an island but because there was a section of the public who didn't like the being talked down to stuff - the 'calm down dear' attitude. Think Rochdale scandal too though. Or North Staffs.
We are seeing a dumbing down of a lot of public debate due to social media but there is also this rise in politics being the new rock and roll amongst young people too. I don't think they are all going to roll over and be Starmer allies the second he gets into power. Starmer then becomes the establishment and the very person to blame for shit.
I could be wildly wrong on this. But I have a fairly good eye for what's coming next in British politics. I don't think it's going to be the plain sailing many expect from such a huge majority. Give it 12 months. Look at how good starmers personal approval ratings are. He's regarded luke warm at best now.