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

Is this in person or via text messaging? If in person it should 100% be corrected via text it's up to you if it really bothers you or not.

He or she should be stopped immediately and corrected. It's a total sign of disrespect.

I would have immediately been in his face and - assuming he still served in some capacity - remind him how he was trained. Then I would tell him if it happens again I'd have a conversation with is chain of command that might negatively affect his future.

I would have immediately been in is face and remind him how he was trained and - assuming he still gets paid for his service - tell him next time that happens I'll have a conversation with his chain of command that might negatively affect his future.

And as for the "Outside work." Unless It's been changed and I didn't know it. Regulations say that if said individual recognizes you as an officer in or out of uniform he/she is to address you as such and show the respect due to an officer. (Or any other rank for that matter.)

You need to take this young individual to his NCOIC and discuss what has happened, I believe that the NCOIC would and should be responsible for this soldiers retraining as to proper decorum when addressing an officer, and most NCO's would see that the standard is followed. No, NCO will tolerate disrespect from his/her soldiers.

You said it, outside work.

In any environment an on the spot 'tactful' correction should be made .

CPT (Join to see), in my opinion, if it doesn't bother you, why make a big deal out of it. Are you civilian clothes when the "hey man" comments have been made? If they are and he doesn't know you, then I would let it go. If it's happening while you are in uniform, totally different approach.

1LT Ralley, As an officer in the US Army, you have a responsibility to the E-4 as well as to the good order and discipline of the army. As SFC O’Mally said, ignore a failure to meet the standard sets a new and lower standard. I would have a stern but friendly talk with the soldier while explaining the breech of the courtesy and why it is important to uphold.