
It would, for me, depend on HOW this person reacts - how angry they get over the phone. And to defuse a situation, if you want to!! (there will always be other perhaps better owners for your precious puppies) I'd suggest you invite them to come visit so you can discuss all of this face to face. You do have to protect your reputation though, so try not to let this get into a slanging match I'd suggest. In other words, I'd not get into all that over the phone!
"Their reply was, I have already own a dog so I know how to look after them so I don't want to be questioned by you. Just because she was rude it doesn't mean we have to be rude back. " Repeated (above) from your other question about this situation. And again be aware, this person could start spreading the word about you, if he/she is so-minded. So try to defuse as suggested above.