I've had this happen many times. Playing in a sanctioned event means you are there to play by the rules. Everyone has to follow the same rules so why am I the dick when you are the one violating the rules. AND THEN the other mofos in your group won't even back you up on it. THAT'S some bullshit.
People who aren't as good as you/barely better, but think they can give you advice somehow. Even better, when the advice is blatantly obvious. Ex: You grip lock your disc (rhbh) and it flys off to the right. "Yeah, a little more to the left"