I do the same thing that I do with people who are futzy at me about my keeping seahorses. I tell them that mine are captive bred and are third generation captive bred. If they object to that, I inform them that we breed them in captivity so that one day we will no longer have to gather them from the wild at all. Even if that is unlikely(as in BPs) it is still a reputable goal, and one day might actually happen.
Of course I also have the fact that seahorses are endangered and on CITIES special listing too. But the same principle applies. Captive bred animals are not going to be able to do out in the wild and survive very well, especially not albinos and someo f the other morphs. They are bred to be kept as pets.
Foolish people exist everywhere, and unfortunately are not even close to becoming extinct. Ignorance can be cured, but only if it is honest ignorance, and not stubborn stupidity.
Glad you keep your temper, and one day who knows, you might eventually come to explain it to him in a manner that he will understand. Hopefully one day he willhave a "Ah-HA!" moment and come to his senses too.
W.