The most effective way to change your attitude is to be able to recognize that the only way someone can make you feel anything is if you allow them to. It has nothing to do with dressage.
because I don’t spend my time crapping on people who are at a higher level than I am, I am much more able to ignore the muttering that may be happening about me. I take the time to get to know the people that I need/want to know and don’t waste my time worrying about other people. And I have no problem saying “there but for the grace of God go I” in response to gossip that is mean or vindictive.
What other people do just doesn’t affect me. When it affects me or my horse, then I engage. Until then? Not my circus, not my monkeys.