Believe what you want. You've already decided that you are both offended and correct, so there's nothing that anyone can say to change your mind. Just understand that not listening doesn't make you right, it makes you a zealot.

Mink whaling is more responsible and sustainable than a lot of commercial fishing - compare the impacts of hunting a species that's classified as "least concern" with deep-sea trawling, the hunting of certain endangered species of tuna, or the use of the eggs and/or young spawn of endangered fish as caviar or whitebait!

Whaling definitely needs to go but (non-Antarctic) whaling gets an oversized amount of attention and it's not unusual for people who are opposed to it to be financially supporting even more destructive forms of kaimoana.