Sloegin
We thought it very weird, and a bit rude, when visiting rather twee friends in Surrey about 40 years ago, to be asked to remove shoes! Haven't experienced that since or ever occurred to me to remove shoes unless muddy.Didn't realise it was a 'thing' until I discovered Gransnet and Mumsnet. I grew up on a farm so was used to removing wellies at the back door but not any other shoes. Have lived in N.ireland, Kent and Devon and never came across this with any friends or neighbours. I must move in mucky circles!
I have only experienced it once, and it seems very prissy to me. As you say, weird and a bit rude to ask or expect it.
Gransnet and Mumsnet teach me a lot of things that happen in some circles, but not mine,