They don't want to be patronised with "pink it and shrink it." I think footwear and clothing were mentioned as needing a female fit (I think football boots are going through something similar), but bats are just a spec. It either fits them or it doesn't. They didn't feel like it needed colours traditionally associated with females to make it "for them." (This became apparent when buying a kit bag for those new to the game)
So the objection is to the use of "female" colour schemes, not the production of women's size equipment. A five minute Google found at least 3 options for women's size kit in neutral colour schemes.
Kit bag, I'm not sure I understand why you couldn't just use/buy a men's kit bag, works fine for the u15 girls I coach at my club.