I don't have a problem with a 16 year old umpire, BUT....he did act improperly after being provoked. I believe he now needs training, not suspension.
The actions of the umpire, although meant to be in accordance with the rules, were not. He has NO AUTHORITY to enforce the rules until he enters the field as the official for that game. He umpires a game; he doesn't police a complex (unless the league has provided him that authority). His actions were out-of-line and he needs to better understand his position of authority.
Still, the expectations of a 16 year old umpiring youths should be taken into consideration when comparing it to the actions of the grown adult. While the umpire felt he was acting according to the rules, the adult was merely being abrasive to start the incident.
I agree that I'd not suspend this official, but that he needs further instruction.
The parent needs to be history to this league........if not permanently, at least for a period of time. Adults make errors also.
Just my opinion,
Freix