I really could care less what people call there horses, as long as they are taken care of.
I don't call my filly anything unless the situation specifically asks for some sort of explanation of her past.
Then I like using the word 'adopted', because that is what she is. Although it can be argued that she was perhaps 'rescued', but not by me... rather by the organisation I adopted her from.
However, what does bug me a little personally, is that I often feel as if I have to describe her as a 'rescue' and be vague about it, and then people will respond positively and happily to some imagined evil. Because I've noticed if I really say where she's really from... people don't seem to believe me, and it kind of bums me out to know people think I'm making something up. Not so much in my real life... where people here know about the animal testing thing... but online: awkward.