I completely agree with you. It is rough to be a SAHM and live on one income and have an anti-tv value for our children. My baby is only 5 months, so it's not hard yet.
My brother asked me once what shows I was going to allow for my baby to watch and I said, "well, we don't have a tv, so hopefully none." and he laughed and said it's too hard to keep kids away from the tv. I just listened. It's hard to argue with him when my baby isn't old enough yet.
Maybe you might have come off too irritated with her (completely understandable), but maybe that's why she was offended. Sometimes all we can do is laugh and let people stick to their own opinions until they can see different.