What a great blog, thanks for being willing to share this! Boy do I understand what you meant about the parents with neurotypical kids giving parenting advice. I've been there, and have really had to suck it up and keep a polite face on.
I've got a really great gfcf bread recipe I could pm you if you're interested. I've been cooking gf for the past 5 years or so for my whole family. I've also got a corn bread recipe, if your son eats corn, that is really good.
P.S. There is a gf group
on ravelry, as well, if you're interested.