Autonomous Insulting/Mean Interactions/Fighting (Patch 1.108.349)

I play rotationally and my families are in Dynasties and some even Royalties. Since RL pack, I played four of them and I am disturbed by the constant mean actions between them, although:

• partners family dynamics is Close, romance Wholesome or Steamy and very attracted to each other. I play a lot with Loyal, Good, Generous, Family Oriented, Idealist traits. 
• relationship with parents is Close/Supportive, the one with kids are Supportive/Permissive
• none of them have a negative trait, all dislike Rascals, Argumentative, Mischief.

There is no fundament for sims being mean, insulting each other during a cheerful/pleasant even romantic conversation. And still happens although it should not by the way I designed them. I can bear with mischief interaction - although they dislike it, but not with mean. 

Of course, after being mean the option to apologize appears but it will not solve the negative feeling between them and it is also decreasing the relationship level. And this is not the way I want them to evolve. 

I play mostly occults. Own all packs (except few Kits).