Using any emote/song on any NPC

I heard emotes/songs behave strangely, I tested it and stopped doing it until I get confirmation if it’s a bug or not. It seems like any emote/song can be used on any NPC. It happens if you use a emote/song and talk to the NPC at the same time.
So, is this safe to do or not? Thanks.
Rapport

Any update on this?