What happened to the "White Crow Society?" Did mainstream science completely push them to the sidelines

For those of you who haven't heard of them & are going to answer anyway, their motto was "In order to prove that a Crow could be White, you don't have to prove that all crows are white, you just have to prove that in one instance a crow isn't black."

that is a standard method in science

one exception proves an absolute statement cannot be Absolutely true

BUT you have to define what a "crow is" independent of color