If transhumans are easily identifiable, then I agree. But imagine a GATTACA-like future, where genetically-enhanced humans look just like regular humans - they

If transhumans are easily identifiable, then I agree. But imagine a GATTACA-like future, where genetically-enhanced humans look just like regular humans - they just happen to be at the 90th percentile in intelligence/fitness. There is very little that people can do in such a scenario.