dislike, stupidhead. not about being a hero, but I do think it IS nicer to get a dog that has been treated horribly or abandoned and is living in a kennel. nothing about having any dog is cheap. and to some degree, you are taking more of a risk that your dog will have behavioral issues, so I do think it is a respectable thing to do. and most of the time, "she/he's a rescue" is in response to someone asking about breed or age and it's a quick way to explain that you don't have much information about the dog's origin.
sure, if an opinion that contradicts yours and having actual experience with the subject=defensive