No, and I think the main reason for this is the “prestige non-rhotacism” of British ReceivedPronunciation.
You know how typically in American accents you canalways hear the “r” sound? Well that's rhoticism, andit's perhaps the difference between British andAmerican accents that most stands out.
One of the things that really gets up our noses is “Americanisms”. In Victorian times we wouldplay fast and loose with our own language to our heart's content, but with the old orderupended a large number of these innovations started to come from the wrong side of theAtlantic, and so to preserve our Britishness it is now our duty to identify and reject all suchdilutions of our pure language. After all, it's called English so it must be ours!
I have a Canadian accent but live in London. Most people I meet assume I’m American. Thosethat guess that I’m Canadian often say that my accent is softer that an American accent. Isuspect that this means that they find American accents harsh, and Canadian accents a bitless harsh. They certainly don’t consider them refined.
I don’t know what you mean by refined. However, I do like American accents and generallyprefer listening to them than to many British accents which can sound so dull.
I grew up in south east England and the typical middle class accent spoken there sounds reallywhiny and uninteresting to me. I’ve had friends from various places in the US with differentaccents and most films, videos and tv shows I watch involve Americans. I don’t think ofAmerican accents as being in any way exotic.
I like the fact that an American is judged more by the words he speaks than the accent withwhich he speaks them. In Britain politics, theatre and cinema, along with all manner of powerfulpositions are filled with bumbling toffs talking nonsense with posh, “refined” accents. The onlyreason many got where they did is because they come from a wealthy or aristocraticbackground. Success due to background is not limited to the UK, but I always liked the factthat the President of the USA will speak in the same way as most people from the same area, rich or poor. Bill Clinton’s Arkansas southern accent is a modern example of this.
Listen to the words, not the accent. Then you will truly understand how refined the orator is.