"B. All Army personnel in uniform are required to salute when they meet and recognize persons entitled to the salute. Salutes will be exchanged between officers (commissioned and warrant) and enlisted personnel, and with personnel of the Armed Forces of the United States..."
You don't salute the person, you salute the rank. Common courtesy and professionalism dictate it. However, location and surroundings may dictate otherwise..such as school setting where there are dozens of mixed ranks milling about, it would make no sense to walk around with your arm crooked. I do remember that as a Sgt, a young 2nd Lt pulled me aside and chewed me out for not saluting him as we passed while at the doors of the PX. When he was through with his recitation of the rules and regs I apologized and then reminded the young Lt. that when he saw me we were more than 20 paces from each other and that a salute was not required. He turned red faced , I think because his wife or date was watching him get schooled, and I then said, "By your leave, Sir!"...at which time, somewhat flustered, he saluted ME...and I returned his salute and smiled at his wife as she smiled back....
For the 1LT's I work with, a salute seems acceptable the first time you see them in the morning, but after that it gets you a glare.
I for one would never really expect a salute from a 2LT as a 1LT, and not a 'ma'am' once we had a working relationship.
Your response to snide looks and glares should be returned with a glare of your own and some peer-to-peer leadership/mentorship just like your SNCOs will be offering to you.


Officers
Customs and Courtesies
Army
Saluting
AR 600-25
