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

if you do not know the individual on a personal level and are in his chain of concern or he knows you are an officer, then yes.. you should correct him, but if you met them and got to know them on the outside, then there is no reason for you to pull the rank issue.. if he's professional, he'll know that while in uniform he needs to address you properly..

If you're both out off uniform and off duty- no. You'll just make yourself out to be one of those asshat officers.
If either one or both of you are in uniform and/or on duty, then correcting the Specialist is the correct thing to do.

He shuld be dressed down

Hell yes! you do know what an Officer is don't you? act like one!

I once filled a Sgt.slot for an Armor unit at Ft. Knox for a month. The e-4 thought he could have his way with me,an E-6,I locked him up and the 1st sgt took offense to that! The next day at the motor pool the same troop was assigned to my track for preventive maintenance and he didn't know how to use a TM manual! I was taken aback at the disrespect I would go through the time I was attached to F- troop, so to speak!

Yes, you should. The words "Hey" or Hey man" are those one would use in an informal relationship or with one's peers. Those are not terms used when one is showing respect or deference to one entitled to such respect or deference based on rank or social status.

Don't get too friendly with him after hours or he will use it against you on duty.

If he knows you are a superior commissioned officer, and the STAFF NONCOMMISSIONED OFFICER addresses you in FAMILIAR TERMS, then the STAFF NCO has just violated ARTICLE 89 of the UCMJ…refer the miscreant to the CSM and he can Jack this guy (or gal) up and have the Legal Admin Officer give a formal counseling entry into the SERVICE RECORD BOOK (SRB…or whatever it is called in the Army); counsel the SFC that if it happens again, there will be an ART 15 HEARING for NONJUDICIAL PUNISHMENT. If that’s not strong enough, refer to the JUDGE ADVOCATE to prepare an ART 32 Investigation and further Referal for GENERAL COURTS MARTIAL (GCM).

Use the UCMJ on the 2% that can’t be good to great Soldiers so that the remaining 98% get the message about disrespecting superior commissioned and noncommissioned officers.

yes rank is earned and to be respected during work hours if your off work that your choice

yes rank is earned that why you wear insignia