I really very strongly dislike it when parents are vocal with umpires. If our coach wants to protest a play, great. He knows how to do it right, which is to say, calmly and without getting into a fight over it. Once the ump rules against you, accept it and be quiet. I suppose occasionally an ump might change a call based on an argument but I've not seen that happen yet. I have seen a coach get thrown out of a game for arguing though. A parent too. No good can come of it. And yeah, at 18 to 0 just get the game over with and move on. Really who cares about one call at that point. JMO.
^this. If I'm good terms with the coach I might say "hey coach you might want to challenge that play based on rule x, y or z" but I'm not going to call an ump out on something from the stands.