Does the AIM really require anti-collision lights to be used during the day? AIM 4-3-23. Use of Aircraft Lights
  a. Aircraft position lights are required to be lighted on aircraft operated on the surface and in flight from sunset to sunrise. In addition, aircraft equipped with an anti-collision light system are required to operate that light system during all types of operations (day and night).


Doesn't this imply that anti-collision lights are required to be on during the day? This is obviously not the practice?
Anti-collision lights are required for day and night as specified in the AIM. There's an exception to turn them off if it interferes with the pilot's visibility (e.g. while in the clouds the strobes can be distracting).


  This is obviously not the practice?


This is the practice.