I think it's that all the cases that societies accept as valid pace no greater value on one gender of child over another. They say "I wll not have a baby for economic reasons" or "I will not have a baby because it has CF/Downs/etc" is valid, but "I will have a boy but ot a girl" is invalid because it causes societal problems (too many boys) and is gender biased ("girls are worthess").
In general people are more upset about the value judgemet being made in abortion for gender reasons than they are in abortion for health or financial ones.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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