Is calling a Master Sergeant by their full rank showing higher respect, or is just extra?

My son is a Staff Sergeant how is he addressed?

How you address NCO's and Officers alike is addressed in AR 600–20 • 7 1–6. Military grade and rank Table 1–1 Grades of rank, U.S. Army, All ranks from E5 (SGT) to E8 (MSG) are addressed as Sergeant with the exception of First Sergeant and the Sergeants Major Ranks.
Grade of rank: Master Sergeant
Pay grade: E-8
Title of address: Sergeant
Abbreviation: MSG

You must be in the Army. If you were in the Corps, this wouldn't even be a question. It's always master sergeant.

Having been both, a 1st Sgt is not a forever rank ,MSG is. One can be a MSG and be appointed
To a. 1SG slot by orders. You are promoted to MSG. . I retired in a 1SG slot.
Anyone can correct me if I am incorrect, things may have changed. I have been retired since 1996.
I was also appointed to SGM , but never promoted to E9. .I retired as a E8 MSG.
Call me what ever, just keep the check and Tricare coming for 28 years of service.
Thanks to any and all for your service. God bless you.

When I was in there were only 4 ways to address an NCO in the Army. Corporal, Sergeant, First Sergeant, and Sergeant Major

I think you use a combination of both.

For instance saying something like, go see Master Sergeant Billings, you could use it all. So whomever you are telling knows that you are telling them to find a Master Sergeant.

But when Master sergeant Billings says something and you respond, you say, “roger, Sergeant. Or when asking the question, you say, “Sergeant Billings, can I do......”. Sometimes I think it is more appropriate for clarity to use the entire rank. But per the book, Sergeant is an acceptable response.

FMF Corpsman here. The Marine way is full rank. Except lieutenant colonels and generals, for some reason.

Phone calls and correspondence is important to address as CSM or MSG. Other than that SGT is fine. In 30 years these two differences are all I have ever been told to do.

According to Army regulations in effect in 1987, ALL NCO ranks from E-5 thru Master Sgt. are to be addressed as "Sergeant so&so"! 1st Sgt's are to be addressed as "First Sergeant" & E-9's are to be addressed as "Sergeant Major"

By the regulation. There's a reason it's there. I had problems with a lower ranking subordinate. She told me that I will refer to her as Private first class. Took her straight to the book. Showed her, her rank and title. Including my own. I was an SFC.