while true, i'm not sure we have a sound basis to prevent individuals from doing it wrt individual freedom. on its face, it seems to be that any pro-choice argument implies this too. if it's the mother/parents making the choice and not the state, i can live with them choosing to attempt designer babies. i fully expect others who are pro-choice to answer the same, up to whatever point they're still pro-choice, because that is what is implied. to argue otherwise is itself anti-choice.
i don't think it's possible for that to square, logically:
- mothers should be able to abort fetuses before a certain point, generally
- mothers should not be able to abort fetuses based on sex before that same point
if by "against" you just meant "they don't like the idea but wouldn't act/vote to stop it, instead simply disagreeing with that reason for the choice" then that's different/*is* consistent.
otherwise, if someone genuinely believes #1, it is impossible for a coherent person to also believe #2. it's no more worthy of consideration than allowing or preventing human abortions because of the rhino population in africa. complete looney tunes. if a person believes 1, they can't actually believe 2. it's not a thing.