When an E-4 calls me "hey" or "hey man" knowing that I am an officer, should I bother to correct him?

Outside of work is different than during working hours. During work hours I even call my friends who are officers sir but outside of work I call them by their first names. Since you don’t directly work with this person and it’s outside of work you are the problem.

If he is a SPC , he should know better .

Never allow a slight or disrespect because it will encourage the person doing it or those observing that person, to do the same.

It does not matter if you are on duty or off, from the same command or not. Respect for the rank carries. So next time you see them and they say "hey man" show him the same respect that he just showed you and let him know who you are. Respect is earned not given, so if you earn it make him respect. Your choice.

What happened to our military? It used to be a well disciplined force. Now we’re asking questions like this? I tell you it makes me sad to see the lack of discipline our military has these days, and it’s going to lead to an ass kicking when the ball drops. SMH

Yes, sir you should. Having a respectful, professional culture in the unit does not dismiss the superior/subordinate dynamic. A suggestion on how to handle that situation would be to ask the Soldier (standing at attention, of course) "Do you address your NCO in that manner?" If it's yes sir, you have an NCO failure. If it's no sir, say "Then who trained you to think that's an appropriate way to address me?" Forces them to take accountability for their actions. If you think you got your point across, I would maybe leave it at that, but if your not confident the lesson sunk in, maybe find out who the NCO is to receive further corrective training.

Yes, he needs to be corrected, you are not friends or buddies, his direct report such as a platoon SGT. Needs to be made aware of you dressing him down on it, if it happens again he should receive what we in the Marines called office hours, that's writing up his offense and standing in front of the company's CO, next offense would be more severe. The chain of command is important. Anyway thats my opinion CPT.

H. E. Double hockey sticks YES!!! Speaking as a former E-4, sir. You need to fixed it. Even when I said "hi." "Hey" "howdy" if it was an officer always with a sir or ma'am. Never hey dude, hey man. I even called enlisted officers by rank or sir or ma'am. "PO Martin sir..."

Demand respect and give respect and you will always get respect. Till you tell this E4 otherwise. But never while in uniform it disrespectful to you, your uniform and everyone who came before you. Remember your uniform is a part of a history that is the military and if nothing else the uniform get respect.

yes. definitely

Bootcamp and basic training both teach the same lessons. It's up to the student as to whether he/she "gets it" or not. Whether in or out of uniform, officer or enlisted, common and correct courtesies STILL prevail. If he/she can't figure that out, they shouldn't consider reenlistment as an option. One day, they're going to run across the wrong " hey man" and they're going to get they're going to get their proverbial clocks cleaned, if you know what I mean. "Shape up or ship out"!