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

Technically we're soldiers 24/7 so outside of work you're still a soldier so rank does not go out the window. N
ow if you were both drinking and partying then then Hey man is just fine.
But if you guys are not drinking buddies and your work acquaintances then he has to call you sir point blank. It's called decorum and respect for the rank. Some of these new age soldiers don't know Jack s*** about how to be a soldier... what are they teaching you guys at basic training nowadays?
Lock his butt up rickety tick if he does that again. An correct his butt, what an embarrassment to the E4 mafia........

Is this in a civilian setting? or duty setting? If duty, such would be inexcusable and hence discuss a correction

Off duty out of uniform? You put your pants on just like he does, on duty in uniform absolutely make him stand tall.

If you do not correct an E-4 for this disrespect, you will loose respect from those are responsible for. You might as well hang it up. You lost. As an E-6 if I heard it I would be allover them!

He should call you sir anywhere he sees you, you are still an officer, Semper Fi

Yes.

You Better!!

Depends. If you are on the basketball court or participating in a sports event that is one thing; HOWEVER, on base shopping, at lunch or a social event that is completely different. As an E2 I umpired softball. I called people out, discuss [argue] calls with the coach [Bill]. One day I saw "Bill" in the Exchange [neither of us was in uniform]. We talked for 5-10 minutes. A week later, I saw "Bill" again. This time it was Lt. Col Bill. Although Bill was not in my chain of command, we were able to separate the job from non-military events. When in a military setting, he and I showed mutual respect for each other. Hopefully, this will help.

If you were in uniform, kick him in the balls.
However that is the very least I observed on the various bases I visited in the past. Eye lashes, large hooper rings, 2 guys in uniform (both Capt.) walking hand in hand into the Commissary, unshaved, extremely large afros and so on. So the "hey Man" is although wrong, no big thing. Until such a time that the department of the military decides to enforce discipline and follow the rules, don't be surprised if he ask your wife for a date next

Ummm yes sir you correct him.