Similar to the E-2 question, how would you react to a young 2LT who is being unprofessional with a strong sense of entitlement?

Find out who they are, command, and CO and report the conduct. About all you can do.

Don’t send them to a combat zone.

What is a headset, like radio headphones?

Ignore him/her to the extent I could, then jack them up when the conditions were right. Nothing worse than an arrogant 2LT. MAJ (Join to see)

Tell a 1st sergeant, if that doesn't work suck it the hell up, he out ranks you.

This type of action is totally un-becoming of an officer and he should be immediately be reported to his commanding officer. It's apparent to me that this young officer has a lot to learn, as most Butterbars do (no offense). In my career, I have trained several young LTs and there education always seems to outweigh thieir military experience. Hopefully, this young officer be correct his actions and learn that rules, in fact, do apply to him.

I had many during my career, call tattle tailing if you want but I would address them and if they didn’t want to listen, I would have a chat with the commanding officer about what I saw and how unprofessional it was.

First, I do not use the word "react," because it assumes lack of thought before taking action. As most all of our police, fire, and special tactics personnel do, in both military and civilian sectors, I "respond." In such a case, to prevent any chance of escalation in a Commissary setting, I'd tell the 2LT to have a great day, and then later, without his or her knowledge, I'd snap a few photos and provide them to the appropriate chain of command, with a note that my professional offer of advice to remove the headset while in uniform was met with, "that rule does not apply to officers."

Yes, as a professional yourself, you are compelled to do so. If he refuses to hear you out, you need to speak to his OIC, the young Lt needs a "reality check". Some of the most valuable advice I was given during my carreer came from NCO's who cared about the future of the Army.

Inform LT of infraction. Remind LT of leading by example. Report LT to their Chan of command, ensure employees of establishment can reinforce complaint.