“true”?
Look, are you trying to make a case for absolute standards? If so, then just say so. I can’t tell what you mean by these abstract terms like “right” and “true” when one is talking about making judgments. When I decide that my steak tastes bad, is that “true”? What difference does that make?
I consider it “wrong” to purposely NOT educate an entire gender, but it is not because I appeal to an unspoken, indeterminable absolute standard out there somewhere. I have a hierarchy of values, and, as a teacher, I put equity of treatment toward children higher than I care about equity of treatment of adults.
You seem to be trying to push ethical decision making–which is actually often very complex–into some sort of logical yes/no or right/wrong box without yourself giving any definitions of the standards to measure by.