Great Question. It depends on how bad of a violation they have committed and where you are in the chain of command.
If what they have done is a one-time incident or very minor in nature, a butt chewing is in order for the NCOs. The unit may need to hear a talk about respect. Consider having the NCOs conduct the class as corrective training.
If it is more serious or if it has happened more than once then you can bet it is a behavioral problem they have had for awhile. In this case I would recommend at the least a strong counseling statement given by at the platoon sergeant or platoon leader. If the acts were very serious or if they have happened many times, I recommend a local letter of reprimand. This is the point where a comment could potentially be made on their NCOERs.
If you believe the issue is really bad, recommend an Article 15. The charge for this might be abuse of subordinates or hazing. Both are punishable under the UCMJ and this should be considered if the issue is significant.
Comments
Part-Time-Commander
If you are higher ranking that the NCO who is disrespecting his Soldiers, you could have a talk with them about it. That way you give them the benefit of the doubt and give them the chance to fix it. Or, you could talk with their supervisor.
If you are lower ranking than the NCO, you could address it to your chain of command; however, please keep in mind that it could backfire on you. Another option (if you are lower ranking than the NCO) is to send an anonymous letter or note to the chain of command.
I hope that helps.