You can not pick which rulings to respect.
It would be unsportsmanlike to pick and choose which rules or rulings you wish to accept.
When I was 8 years old and playing Little League baseball, I was taught not to argue with the umpire. If I was safe but called out, I was to accept it and go sit down. I did not understand that this had to work both ways. I was catcher and the umpire called the runner out at the plate. I knew he was safe and argued for that call, unsuccessfully. After the game my father explained to me that we have to respect the umpire no matter which way the call goes. They will not be right all the time but we still must respect their decisions.
Conceding is out of line? That makes zero sense. There is no way it is ever out of line to concede/forfeit. If a ref tells me "you win", and I say "no, I forfeit," how is that out of line?
It would be unsportsmanlike to pick and choose which rules or rulings you wish to accept.
When I was 8 years old and playing Little League baseball, I was taught not to argue with the umpire. If I was safe but called out, I was to accept it and go sit down. I did not understand that this had to work both ways. I was catcher and the umpire called the runner out at the plate. I knew he was safe and argued for that call, unsuccessfully. After the game my father explained to me that we have to respect the umpire no matter which way the call goes. They will not be right all the time but we still must respect their decisions.