I disagree. First, we must agree on what it means to discriminate. To me, discriminating means observing a difference. The OP is correct in that the word did not have a negative connotation in the past. In the '50s, for example, there was a cigarette ad on TV that claimed it was the “cigarette for discriminating smokers.” Such an ad would not work today given the negative connotation. Came the '60s and the civil rights movement, and stamping out “racial discrimination” became the cause célèbre. People, being lazy, eventually dropped the adjective “racial”, and “discrimination” became understood to mean racial. But then they started to notice that discrimination was all around them, but they didn’t realize that most of it is desirable, but we haven’t been able to sort it out. To prove the point, I asked my secretary if she ***didn’t ***want me to discriminate between her good performance and another’s poor performance come annual evaluation for cash bonuses. You can guess her response. But the negative connotation still persists. The word has such a bad reputation that we have reached the point where discriminating between good and evil is itself the worst kind of evil.
So, I could observe that someone has dark skin and another has light skin. Have I discriminated? Yes. Did I do something immoral in that observation? No.
To the Modern Liberal, indiscriminateness is a moral imperative. The only way to be moral is not to discriminate between right and wrong, good and evil, better and worse, truth and lies because an act of discrimination might be a reflection of personal bigotry. Indiscriminateness is a moral imperative because its opposite is the evil of having discriminated. No wonder our thinking is screwed up.