But this is wrong wrong wrong, so wrong that it's almost a trivial logical fallacy: just because most dogs have 4 legs, doesn't mean that all 4-legged animals are dogs, nor that a dog with 3 legs stops being a dog. Testing for "dog-ness" by counting 4 legs, is wrong. Likewise, just because a school district designs an arbitrary test of "gifted-ness", doesn't mean that all children who pass it are gifted, nor that children who don't pass it have no gifts. These tests cannot possibly capture the full range of human gifts.
You are arguing a strawman that the person you replied to never stated. Yes exceptional people exist, this was never under debate and that poster did not claim otherwise. But "gifted" programs do not perfectly identify all exceptional people across all dimensions of exceptionality with universal perfect accuracy. Replacing "gifted" programs with accelerated learning programs could achieve the same goal of offering advanced learning for SOME exceptional students, without going through the fundamentally flawed and oversimplified binary sorting process that inaccurately labels all students as either "gifted" or "not gifted".