Please see above I just added a paragraph to my response. I still beg to differ.
Pib said:The thing -that has nothing to do with rules- is that one may sound a bit pretentious when using 'the correct pronounciation'. Specially in languages other than English that is more common around here.
Chiri and I have discussed this: Most times I refrain from pronouncing many 'foreign' words correctly simply because it sounds affected to my ears, even when I know perfectly well the correct pronounciation. A lot of people could be doing the same thing.
An example: I can pronounce the French Rs correctly. However, if I am speaking either Spanish or English and I have to say, Creme Brul?e, for example, I don't use 'french rs' because it makes me sound like Pepe Le Peu.