A group of young people on the street laugh at you and call you fat and ugly. Why not just remind yourself how those poor, miserable dolts probably didn't get enough love as a child, and pity their ignorance?
Because you can instead remind yourself how these unfortunate kids may actually not have received enough love or guidance, and you can wish that they do get on track before it does them and others more harm.
Okay, so maybe it takes some practice to get from the first response to the second, but it sounds worth it. Do you really want to cultivate condescension?