This is the unfortunate truth. If someone has "easier" children they become even more judgemental of "difficult" children. They take it as a skill issue as if their expert parenting was all that mattered and thus other parents are failures.

If you had that "difficult" child with the set of social circumstances as that family, then you might have struggled too. Withhold that judgement. Most are trying their best. Sometimes you might even see me "doing nothing" about my out of control child.....but that's because I'm trying to regulate myself before I lose my shit; just need a moment.