From what I can see from the tuning files on "trolling the forums" this action is whitelisted for the following traits (so if they are any of these that is why they did that):
<T>16836<!--trait_Evil--></T>
<T>16830<!--trait_Childish--></T>
<T>16841<!--trait_Geek--></T>
<T>16845<!--trait_HotHeaded--></T>
<T>16848<!--trait_Insane--></T>
<T>9602<!--trait_Loner--></T>
<T>9620<!--trait_Snob--></T>
<T>16857<!--trait_Mean--></T>
It is not based on likes/dislikes, that tends to be used for applying positive and negative buffs when they have or do certain actions/interactions.
IMO, they should add blacklist too according to both traits and dislikes, which in the internal files still regards likes/dislikes as a trait:
<T>264149<!--trait_SimPreference_Dislikes_Activities_Mischief--></T>
I never have those traits selected on my sims and I get the mischief skill anyway from the sim either coming into contact with another sim that has the skill or by trolling the web.
That was just for "trolling the forums" file, as for the rest of Mischief actions...
Ya, annoyingly enough some (if not all) autonomous actions work on all sims no matter traits and likes/dislikes. They only have slight desire/preference calculation differences. But it isn't enough for 100% prevention, for example simply being in a Playful mood up ticks the chances of a Mischief action... It is hecka annoying. They need to overhaul autonomy.
