The YouTube video that is linked to in the following thread shows it pretty well:
Basically the LC auto adjusts the headlight level based on how much load you have in the rear (as the rear squats, it automatically aims the headlights further down). But when you have a lift, the sensor is only on the back axle so the sensor incorrectly thinks you have some serious rake because of the increased distance between the axle and frame, and so it aims the headlights up to compensate for it. That is why we're blinding everyone.
The fix is to adjust where the sensor arm connects so the sensor correctly thinks the vehicle is level. The sensor is halfway along the rear upper control arm on the driver side. After a 2" lift like mine, the axle side of the UCA stays where it's at, and the frame side of the UCA is 2" higher. Since the sensor is halfway along the UCA, the sensor itself (connected above on the frame) had gone up 2" and its rotating arm (connected at the halfway point on the UCA has gone up by half that: 1". So I just needed to raise that sensor arm connection point on the UCA by another inch. From where it was mounted, I measured 1" up, drilled a hole, then reinstalled.