No, but if you KNOW you're going to pick neutral, but you intentionally let the guy get down and get set before you tell the ref you're going neutral, it's a douche move.
If it doesn't stress the opponent (we agree it doesn't), or give you any type of advantage (it doesn't), then why do it. The only really possible answer is to be a douche.
It's not showing him up, it's not disrespecting him, it's not bullying, he's not staging an international protest, and there are surely way worse things he could do to people. And even if it's douchy, it's lower level douche status. No doubt.
But...really??? If it doesn't gain you any advantage at all, just beat the kid and quit worrying about silly head games.