Shit! You guys are old and out of date. I was umpiring competitive softball 8 yo's and that shits insane. By 12 there was this one little pitcher that walked with her throwing shoulder higher than the other (kinda lopsided).
Shit can get insane so if his son wants to play comp baseball who are yall to shun it.
Anyways dude... I don't know what I'd do in my situation. I'd probably talk to the coach to inquire about the team if it's the ONLY team in town.
When I was 1st grade, my mother knew I was one of the better players on this really good team but the coach put me in right field and rotated on the bench every other inning. I guess he didn't see what we knew. Anyways, after seeing enough after a couple of games she walked me off the field in the middle of one of the games and I switched teams to one of the worst teams in the league. Instantly we were the 2nd best team in the league and eventually that coach and every coach in the league tried recruiting me every year after that to come to their team as I was probably the best player in the league at that age (not tooting my own horn either. Straight facts in my opinion
!).
Basically, have him play on another team if you can and if your son is as good as he says he is then people will notice. If not, then maybe the guy was right.
Look at it as a chance to build some character in the boy... Lifes not full of hand outs... He has to earn it. Here's your chance to see if he has the determination to be great or if he just wanted on the team for social hour.
It should be his choice through hard work practice and determination... Not yours.
You'll know his choice by his actions without being on the team. Will he shrug it off after the dust settles or try to get better by himself or by requesting your assistance.