With "bad simming behaviors", I mean things that you do in your games that hinder you in getting out the best of the game's content. For me, it's the fact that I always, since TS3, think up the story ...
I get ultra attached to a set of parents, refuse to age them up so they remain as they were when they first fell in love, and then get bored because the rest of the family is stagnated with them....