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Intelligence is not determined by family or wealth or love. However, development of skills and knowledge can be influenced by one's life experiences and opportunities.

Reminding yourself to take each person on a case-by-case basis will make you less frustrated, because you'll stop constantly asking yourself why this person isn't acting just like you are.

Both genetics and opportunities can make a difference to overall "smarts." One of the reasons some people appear smarter than others may be that they came from a hard working environment, got good marks in school, and that they started many things from scratch and/or have been stuck having to take care of family members, working a part-time job in high school, or taking on other responsibilities that kept them from spending so much time becoming a smarty pants. On the other side we can see the people who don't appear so smart, they had difficulties to understand things so quick, even when they were kids, they never cared about education and getting good marks at school. When a stupid person frustrates you, just ask yourself if he had all of the best opportunities -- chances are, you'll see that this is not the case, would he use it the same you did. If he did he will not be considered as non smart person.