When I judged a stake, it is because I was asked to by the club officials. If I agree to judge, THEY agree to accept my decisions. It is really that simple. The vast majority of judges do their very best to get it right, because that is what the sport demands of them. The vast majority of folks I judged with would absolutely not tolerate any disparagement of their decisions...nor should they have. There is no place in this sport for poor sportsmanship.
Look, NOBODY goes to a field trial to lose, but if there are ten entries, there are going to be NINE LOSERS. If you can't handle that, you should not be running dogs. Instead of complaining, maybe work a little harder and prepare a little better.