The reason for this is that the only time that the Pattersons smile and mean it is when they're screwing someone over out of sheer wanton selfish malice. While Elly and Liz don't like the smile Mike makes when he jams it to them, they smile the same hate-filled smile when they contemplate the delicious prospect of inflicting discomfort on people that have gotten in the way of them and happiness. The person in question has ususally done nothing wrong and is not trying to ruin the Patterson in question. The problem is that Mike and the others falsely see this as being the case.
This is because they do not want to admit the fact that their way generally NEEDS to be got into. As by way of example, Michael needed to have it explained to him that when other people get things, it's not a slam against him. Most of why he needed to get Lizzie is that he did and does honestly believe that her happiness must be the result of a conspiracy to ruin him and mock him for wanting love and happiness and good things. The sad thing is not that he varies only in degree from his family. The sad thing is that they don't even realize how much they have in common with a bunch of jerk kids in ski masks. More on that tomorrow.