M. is driving me to my wit's end.
My kids have all been slow to develop as writers, and my ds has dysgraphia. As homeschoolers we haven't been beholden to others' expectations, nor have we needed written work for evaluation purposes the way teachers do, so it's been easier for us. But with that proviso out of the way, here are my thoughts:
Has he got an IEP for his vision / fine motor issues? If not, you could explore that. At any rate, I would think a meeting with the teacher would be warranted, in which I would highlight the fact that the current approach is beginning to cast a pall of resentment over all his schoolwork, and you want your 1st grader to love learning, not fight you over it.
Miranda in rural BC, Canadamom to three great kids and one great grown-upunschooler, violist, runner, doc
The irony of the whole thing is that his handwriting looks at least as good, if not better, than mine did when I was a good two years older.