Is singing in the shower built in to the action of showering?

I ask because i have autonomy turned off and i have used MCCC tuner to disallow every action with the words sing or shower in it....AND YET....every time my sim gets in the shower they sing.  I've searched for mods but they seem to only cover the specific interaction that is "sing in shower" not all the rest of every single gd time they are showering and also singing.  This is so frustrating, does anyone know how to make it stop?

I thought at first it was just mood so i could drop their fun and social down to zero before i have them shower and no more opera.  But i just tried that and it wasn't enough.  i have to drop the afore mentioned needs AND remove EVERY SINGLE POSITIVE MOODLET before they start showering.  It is so irritating to me that i am willing to do that every time but it's ridiculous that i should have to.  Someone please tell me there is a way to turn this off.

I'm reposting this from mods and cc area because i guess it is gameplay even tho i cant fix it with MCCC