Would an E9 comply if ordered to attention by an O1?

Yed

I think so BUT, the upper brass would hear of it post haste! And the next liberty ?????????

Don't think so in small group, to save face of his unit yes.

Yes!

The E9 would stand at attention and then blast the O1 from here to Timbuktu and back. There is not an O4 and above alive that would not b
thoroughly back the SGM.

Yes, rank is rank, chain of comand

To answer the question, affirmative, an officer's ranks out ranks an enlisted rank. History goes back since the birth of the Army. However, the O1 with respect to the CSM, should and must realize that a CSM rank has more time in service with more experience while he or she was still in pampers socking their thumb. Given the authority and responsibilities does make make one always correct as an officer. E-5 thru E--9's are the check and balances of the army. These ranks are to ensure orders are given and followed. Regardless if agree or disagree. As an officer 1st, 2nd Lt or Cpt. Realize that a MSGT 1st Sgt, SM, or CSM, has more experience and at times advice and correct your decisions. (So that you can look good).

By rank a SGM has to comply. But a CSM holds a higher office. Anyone lower ranked than O-4 will not even try it with a CSM mainly because they're the right hand to their boss the O-5 or above. Not to mention Officers generally stay out of NCO business just as NCOs stay out of Officer business.

I doubt it would be taken very seriously.

He would comply then in one-on-one educate the young lieutenant.

Not quite a baby-face LT story but still bears repeating.
Years ago I was at a gas station on a Naval Weapons Station. A few people were utilizing the gas pumps. One a Seabee from the neighboring NCBC, another was a fleet officer. Both were in uniform, the Ensign wearing his cover, the Seabee was not. The ensign called out "shipmate", the Seabee ignored him. The ensign again called out shipmate, again, the Seabee ignored him. Frustrated l, the ensign marched over and started reaming out the Seabee chief for not responding to his call of shipmate, then continued for not wearing his cover. The chief calmly finished pumping his gas, paid for his gas and drove away.
Moral of the story? Know who you are talking to. Call a Seabee shipmate? You will get ignored.

Yup, the law is the law, let's hope second Louie is not a raving dick (been known to happen). Moving on...

I use to work in the command group of my battalion and anytime any LTs or CPTs were getting chewed out by our CSM they stood at parade rest

Its the rank you respect not the man commissioned and warrant have that right non commissioned will comply.

Yes it's called respect for the rank

He should comply with the order but the XO and CO would be visited immediately after the disrespectful public humiliation!

Yes he has to comply,

I can only speak as to how my father handled a similar circumstance, as a senior master sargent in the Air Force. And that was to throw the lieutenant out of his office until he understud the meaning of seniority. And I do mean he threw him "physically" out.

He would have to because of the enlisted - officer protocol but I'm sure that there would be something said in private !!

Comply, afterwards tear him a new a$$!