I agree that it is a violation of the 9th commandment. Like you, I also avoid the X by sticking with first name, whenever it's possible. However, when pressed, I refuse to give in to the pressure.

On a previous job working with a local USAF unit, I interacted with a military male who was "transitioning". Using my vast powers as an 'ignorant old boomer', I purposely called him 'Sir' at every opportunity. I could tell it exasperated him, but he never gave me grief or complained to management.