Should You Honor the Local Pronunciation [closed]
Solution 1:
In general, I think it would be deemed odd to pronounce something in a manner different to the vernacular, especially if you are mostly speaking in the vernacular. Whether it is deemed pretentious or not will depend on the pronunciation and the person.
For instance if you spoke in RP (Queen's English) any English speaking nations other than England, and probably even in parts of England, it would likely sound pretentious.
On the other hand, if you say foreign words with their foreign pronunciation (think croissant, or Macedonia, etc) people will think you are saying the word oddly and it may even hinder their understanding a little ("what is Makedonia?"), but they may or may not think it's rude or pretentious. If they feel you are insinuating they are pronouncing words incorrectly, they may be offended.