I like well-behaved parents, because I have been around a lot of ill-behaved ones.
In nearly every youth game that I have officiated there has been at least one—and usually more—fans screaming instructions to their player or entire team from the sideline. Often, it is incredibly poor advice. These are the same individuals who yell when their son or daughter is taken off the field, openly criticize the officials, and generally know next to nothing about how lacrosse is played.