"discrimination is bad except when I like the results"
People who were historically against discrimination are well in to embracing it and don't see the problem at all. Why do we need to accept your preferred set of discriminations and not somebody else's?
Starting with the Civil Rights Act of 1964 and some follow up classes, certain set of discriminationa were enshrined in federal and state law as being protected, so that's why.
No one, or at least no significant faction, has ever historically ever been against discrimination. Discrimination is making decisions.
People have been against making certain decisions on specific bases, limiting the acceptable conditions in which discrimiantion on particular bases is permissible, but literally no one has ever been against all discrimination on bases for which they sought limitations.
The change you perceive is entirely a result of you misunderstanding and oversimplifying to the point of utter nonsense the original position.
The common understanding (disregarding ideologues) of "discrimination" is still not a pedantic dictionary definition (which applies broadly to situations that don't even involve human interaction) is as given on Wikipedia (they do sometimes get politically charged ideas correct):
> Discrimination is the process of making unfair or prejudicial distinctions between people based on the groups, classes, or other categories to which they belong or are perceived to belong,[1] such as race, gender, age, class, religion, or sexual orientation.[2] Discrimination typically leads to groups being unfairly treated on the basis of perceived statuses based on ethnic, racial, gender or religious categories.[2][3] It involves depriving members of one group of opportunities or privileges that are available to members of another group.[4]
The point is that we are interested in the cases deemed unfair.
The problem is that people have wildly different ideas of what is fair.
Just let people do what they want. If they want to pay premia for free association let them and if you think they're abusing it, hey that's arbitrage (ie free money) for you to take from them.
The more you worry about that and force people to do things they don't want to the more everyone pulls away from public socialization and the less there is for desperate people in general.
People who were historically against discrimination are well in to embracing it and don't see the problem at all. Why do we need to accept your preferred set of discriminations and not somebody else's?