And what if an orthodox rabbi allows his congregants to drive to shul on shabbos and eat in any mcdonalds? Must we quitely respect that and mind our own business?
What did you say? No real orthodox rabbi would allow his congregants to do so? Correct. Nor would such allow uncovered elbows.
Its a sad fact that today everything is up for public discussion, and if someone doesn’t agree with something (debatable) a certain Rav says, the Rav is no longer viewed as a real Rav. If a competent Orthodox Rabbi would say its ok to drive on Shabbos, then yes, it would be ok. Because what a real Rav says, even if its Halachically wrong, becomes Halachically correct, simply by him saying it. Same goes for short sleeves.