Only those deliberately choosing to not pay attention will be "shocked" by this development.
Bob Parks: ACLU, Single Mom Gets Father-Daughter Dances Banned
In a society in which "discrimination" -- treating unlike things according to their due -- is the ultimate moral evil, in which (the recently invented) "right" to "self-esteem" is more important than the virtue of self-respect, and consequently it is "immoral" and "offensive" to express disapproval either of the "life-style" of causing children to be born bastards (*) or of the legal and social ease with which women discard the fathers of children, well of course it's going to be "discriminatory" to do anything that could be construed as suggesting that, Yes, Virginia, some little girls do have fathers.
Understand, the whole idea of a father-daughter dance is strange; and depending on the ages of the girls, not too far away from creepy. BUT, it isn't the "dance" the "liberals" are condemning, it is the 'father' in the equation.
(*) Hell! in such a morally twisted and degenerate society, it's "immoral" and "offensive" to use the terms 'bastard' and 'illegitimate birth' correctly.