I thought to myself, "I won't even be able to do that once I start carrying since it could escalate into a situation".
I'll go with spacecoast on this one and agree that you can still 'remind' someone where they are and what they should be doing.
When they react like they did THAT is when you decide NOT to do anything about their ill-mannered actions and let it go.
If you want to congratulate yourself on being the bigger person in that situation IMhO you're entitled to do that. If you want to be glad you were prepared (or will be in the future) to handle things had they REALLY over reacted, once again, IMhO go ahead.