Should a LT stand at ease for a 1SG or CSM?

I think Lt's stand at ease for a CSM in the Air Force....For example, in the Army, as an enlisted, I'd refer to you as Captain or Sir. However, in the Air Force I'd refer to you as Brian or Maurelli...Please, don't get me wrong, I think the Air force is a great alternative to the Military...LOL....JUST MESSING AROUND!!!!

No, officers out rank all NCOs but, respect should be given.

Long answer. I have seen my share of young LT's take on an old bull, and walk away with a horn or two in the posterior. It used to be that the officers were the educated and the enlisted were the cheap labor. Now days most of your Senior NCO'S have as much education or more than the LT's. My commanding general told our junior officers that they need to listen to the senio

Simple answer, no.

Sir,
As a sign of respect, yes a LT should stand, when a 1SG or CSM enters; especially for an E9. It is a sign of respect that is given to a "senior", be-it NCO or Officer. Out of 27 years of my military career, both active and National Guard, I have seen many O-1 thru O-3 stand when a CSM enters the room. Those officers are also the one's who will get the advice of the E-8/E-9 about situations that can be good for the Soldier(s) and for the morale of the unit.
Even today as a retired 31E, I still address officers and NCOs by their rank.
Again... a sign of respect.

I have seen LTs and CPTs stand at parade rest for our battalion CSM. Asked a CPT one day why he was doing that and he reply was he deserves it because that is the best CSM he has ever had. And I would have to agree with him. Most of the time I'm not working in a battalion or brigade of my branch MLS. I have been in aviation, signal and MI and the current Command Sergeant Major has been the best one I have seen in my career. He doesn't care what your amylases he cares that you're a part of his team and a part of the United States military.

Where in the AR can I find this?

no. But honeslty I used to do it and occasionally still find myself doing it. I lose nothing doing it.

If they know whats good for them, they will.

Good question CPT Maurelli.
I don't believe there is a wrong answer. I have a lot of respect for the NCO Corps in general. Standing at ease for a 1SG or a CSM does not take anything away from an Officer. If anything, the Officer that demonstrate that type of respect for his 1SG and CSM will gain a lot. I still to these days stand at ease when I am addressing any CSM. There is just something about respecting and revering that rank and position.