Lmom,

I see what you are saying about handwriting for a three year old. At that age it wouldn't be surprising that the fine motor/dexterity wouldn't be where it needs to be for proper handwriting.
Some kids would be extremely frustrated by this, but some might respond positively.
Are they teaching him how to write, or is he already writing and they just don't like the way it looks?
Is he enjoying handwriting or are these torture sessions to him?
I've been advocating for my kids too. There have been an occasion or two where I just didn't see where the school was coming from, but I gave them half a chance anyway and was surprised how well it worked out for my child.
Unfortunately, though, I feel I always have to be paying attention to ward of disasterous situations when their ideas aren't working out so well.