I had a teen sim go through a mean streak right before aging up and now it's not in her list of traits but she suddenly just yells at other sims, mostly her husband, out of nowhere. No erratic or mean...
I've had this issue before and I remove it by making cheats active (press Control+Shift+C, type testingcheats true and press Enter) and then typing traits.remove_trait childhoodphase_meanstreak in the cheats bar.
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