It was funny. Out of curiosity, and not intending to cast any aspersions "Little Miss Thang," but what would you say your accent is? It didn't seem particularly posh or off-putting which is why it was weird how Heather went off on it.
Definitely not posh. It was originally very much a West Country accent so quite rural, and then I lived in London for over 20 years and it faded a bit. It’s not posh, not particularly London, but not as broad as the accent I had when I was growing up. It’s not dead common, but also definitely not upper class.
I think Heather has potentially not had much contact (apart from her interviews with people) from different countries and probably still associates say a British accent with the archetypal baddie in a film or maybe even the cliche of a posh person from say Downton Abbey.
I was renting a car in Albequeque (is that the right spelling its after 1am!) and the ladies behind the desk were aghast that I had an English accent, obviously not many people rent from Dollar there who are from the UK. They kept asking me to say things and I was grumpy and tired and still had 125 odd miles to go to get to my destination.