Let me get this straight -- Lithwick is blaming the "conservative bloc" on the Court for not reading a retaliation provision into a law that Congress, the group that actually wrote the law in the first place, neglected to include? That gets it bass-ackwards. It's not the Court's job to do Congress' job for it. Frankly, wouldn't it have been cheaper and easier to lobby Congress to fix this provision and make it retroactive? Instead, we're treated to nonsense legal arguments such as the declaration that retaliation itself is a form of discrimination.
Just because something is before the Court does not mean that the Court is responsible for it getting there, or is able to fix it. Lithwick mentions in passing that the retaliation provision mysteriously didn't make it into ADEA, but doesn't bother to examine any further. That is simply bad reporting. Either Congress did not want the provision included, in which case the "conservative bloc" is right to not read one in, or Congress messed up, in which the "conservative bloc" is right to remind Congress that it messed up so that Congress can go back and fix it. All the way along, Congress is the one that slammed the door shut on ADEA retaliation lawsuits. Somehow, though, the Court is made the scapegoat for simply acknowledging that fact.