Hello. I don't know what I'm doing, just as a heads up. I don't like that erratic sims are mean either though. I found no specific mod when searching.
I read this guide:
https://modthesims.info/showthread....6&cb=1629993792
I looked at this description and mod, under Autonomous Socials:
https://www.patreon.com/posts/all-various-51864125
I somehow made a package with these files:
testSet_MeanSocialsAutonomous
testSet_MischiefSocialsAutonomous
I removed this bit in both:
-<L>
-<V t="trait">
-<U n="trait">
-<L n="whitelist_traits">
-<T>
16848
<!--trait_Insane-->
</T>
</L>
</U>
</V>
</L>
And tested it: made 4 new sims with traits: Erratic, Perfectionist, Unflirty. Placed them in new folder and save, on lot Bargain Bend, with lot traits: Mean Vibe, Convivial; & lot challenges: Quake Zone, Grody, Filthy. Enacted Fun Loving NAP. Played for 4 sim days. One sim learned Mischief on day 3, the others not at all. I saw one mischief interaction, but with no relationship hit. They started out as acquantainces and were all friends, two of them were good friends in the end. I never saw a mean interaction. I saw 2 red negative relationship symbols, one was for screaming incoherently, the other when one sim complained about the music (dislike). Only positive sentiments. They did lots of other erratic idles/autonomous actions.
Made a control group, new folder and save, new sims same traits etc, vanilla. Played for 1 simday: all sims learned mischief skill and did mischief interactions the first day. I saw no mean interactions. It should be tested more but I don't wanna, right now at least. You could try to do the same though. I don't promise anything.