“Think of how stupid the average person is, and realize half of them are stupider than that”

Simplified Meaning:

Everyone knows some people who seem really clueless or make poor decisions. Now, imagine someone who seems pretty average in how they make choices and think about things. Remember, half of the people are not even as good at thinking or making decisions as that average person. For example, if you’ve ever tried explaining something simple to a group and noticed that some people don’t get it at all, this quote is trying to make you aware that there are a lot more of those kinds of people than you might think. Realizing this helps you understand why some people act in ways that seem illogical or foolish. Knowing this can help you be more patient and better prepared when dealing with different people in daily life. In real life, this might mean taking extra time to explain things clearly if you're a teacher or not being too quick to judge someone’s actions because they might genuinely find things harder to understand.