It IS offensive when one makes statements like this without actually listening (or reading) what was said to begin with. The dog was pregnant already when he adopted her. He didn't breed her intentionally or even neglectfully allow her to get pregnant.
Good luck with those pups! They look awfully cute!! The reason folks say to wait 8-12 weeks to rehome is that the puppies are learning critical life lessons at that age from their mother and litter mates. They may technically be able to survive just fine at 6 weeks...able to eat and drink on their own....but the miss out on critical socialization skills, such as how to not bite too hard when playing.
EDIT: As for shots...talk with your vet. It's the responsible thing to do to get them their initial puppy shots AND worming before sending them on to new homes.
EDIT again! -- One other thought....when breeders have litters of nearly identical pups, they get different colored ribbons and make little "collars"...giving each puppy a different color. That way you can tell them apart, which is especially important if one of them shows signs of illness or injury or if a smaller one isn't getting enough to eat, you won't have to guess which one it was that needed a little extra attention.