People have chips on their shoulder for many things. But the reason is irrelevant. A person who has gavah (or conversely low self-esteem) will manifest is through whatever mediums they have available to them. If it is not yichus it is the size of the chup they were able to grow.
The important thing to remember is that we all have our chesronos that we need to work on. These people with superiority complexes that you do not suffer from may be able to learn b’hasmadah for hours on end, or are mekayem kibud av v’em in a way you can’t even dream of.
All that aside, taking pride in ones family on principle is a very nice thing and is certainly a way to be mekayem kibud av. Knowing your parents brought zchusim into your family from helping the entire klal I imagine would be almost as much of a source of pride as watching your five year old helping his little cousin.