Going slow in the fast lane
I get really angry when I get behind a slow driver and people always tell me to calm down. They don’t get where the rage comes from. It comes from not being able to understand how someone can be so devoid of purpose or direction that they not only lack urgency in their own life, but they actively impede others who know where they want to go.
It seems to me that the worst thing you could ever say about someone is “You’re not just mediocre, you’re contagiously mediocre.” We all have problems, areas where we are objectively bad at things, but to drag others down–either via obliviousness or malice–is about the most evil act one can engage in.