I guess I shouldn't use the term "rescue." Technically that's most Bettas -- they generally come from little cups or bags and we try to give them a better existence. I guess what mostly irritated me is that the response had nothing to do with care advice.
Really, he was nothing compared to what I've seen at our LFS. I purchased my first Betta there; the batch of fish they had at the time was wonderful -- healthy, vibrantly colored, clean water, etc. The cups were the size of Petco's cups, maybe even a little larger. Now they've downgraded to cups even smaller than Wal-mart's cups. Fin rot. Half-dead. Warped spines. Filthy, filthy water. Even ich and fungus-covered dragons. And it's like that all the time now.
I'm already using aquarium salt and still doing extra water changes. He does have some fin damage, but nothing really major. And he's still INHALING his food; I barely get it into the tank before it's snarfed. I guess it's not internal parasites, unless he has a tapeworm.