This issue is getting quite annoying. I sent my next 3 sims to university with a solo roommate, the game spawned a bi-sexual male who has decided to go from sim to sim serenading them. What I dislike most about this issue is that I have to constantly remove an embarrassment mood from my own sims. If one of my sims is writing their term paper and the roommate decides he wants to serenade he will start the action continually until I cancel writing the paper and tell him to * off.
After attempting to use MCCC tuner, as suggested by @xochiquetzl_xkvn , I have found that this option only applies to sims that you control. Thus this feature is only useful when stopping your own sims when having full autonomy turned on. This is not applicable to my situation as I do not control the roommate. It has gotten so bad that the roommate will serenade so often that the will not care for himself and ends up urinating on the floor and passing out, often times in his own urine. Not to mention the stink from him refusing to shower. I see nothing that will help stop this behavior. I have destroyed his violin more times than I can count, but he just ends up with a new one. There is a chance that I have been able to finally stop this using MCCC, but I had to manually add a string and cross my fingers. Regardless, I should not have to rely on a mod to stop this behavior. (Confirmed that MCCC was unable to stop this behavior)
Any help from EA would be greatly appreciated.
EDIT: The original reports here are about sims that they control in their families, mine is not the same situation. If needed I can start a new bug report, but I figured this was the best place to report this.