so, typically, less experience = less knowledge... obviously it's not that black and white..
most players who HAVE pushed/played at 2200+ have gained more experience and knowledge about pvp, which includes learning more in depth about balance issues. that doesn't give them instant magical knowledge..
most players who HAVE NOT pushed/played at 2200+ have not experienced others utilizing their classes to such high skilled levels.. therefor, they do not possess the understanding of class balance well enough to be a reputable source..
the reason people dont care or want to hear your opinions isn't personal.. they just dont want advice from someone who has yet to reach their level.
put it this way:
If you were a heroic raider, how would you feel if someone who's only done LFR(for any period of time) were trying to give you their opinions and advice...
the whole 'i haven't tried...' statement is completely irrelevant as well. If you haven't tried, why would anyone assume you possess any understanding of someone who has tried, or think that your opinions of the matter are anything other than ignorance?