It seems to me that a great many people misunderstand what God is doing what God chooses people. Trace back in your mind, all the way back to the book of Genesis. God chose Abraham, of all people on earth. Abraham was uniquely blessed. Nobody else was blessed in the same way that he was. But the purpose God had in choosing Abraham was not only to honor and bless Abraham, but also to bless the whole world through Abraham (Gen 12:1-3). The point of being chosen is to be a chosen vessel, and through Abraham God begins to bless the earth again. He is chosen not to be God's sole recipient of blessing, but to be the channel through which further blessings would spread. If Abraham ever once thought he was blessed just to set him apart as "I'm chosen and you're not", the Bible doesn't mention that.
Consider the ancient Israelites. Their literature shows that they understood their own sacrifices offered at their annual feasts to be on behalf of all the nations on earth. They anticipated a day when all nations on earth would come and pray with them, and all would know God. They were not chosen to be an elite who should think to themselves "We're chosen and they're not"; they were chosen to be a vessel of God's blessing to the world.
Consider Jesus' apostles. Among all the Israelites in God's Chosen People, they were uniquely hand-picked by Jesus, "chosen" in a very direct and visible way during his earthly ministry. Again, they were not chosen to be in an elevated echelon with the thought "I'm chosen and you're not". They were chosen to serve the others and lead the others, and those who desired to be the greatest were told to then be servants to all: they would be servants delivering blessings, not elites enjoying perks. They were sent out as vessels of very unique blessings: the knowledge of the Lord and the spirit of the Lord. They were sent to convey these blessings to the whole world by baptizing and teaching. They were chosen to take Christ to the world.
Some tend to portray the "chosen" as a fixed and static group that is intended for blessing while others are not. This is not a Scriptural view of what it means to be God's chosen, God's elect. In Scripture, being God's chosen always means to be a chosen vessel to carry God's blessing into the world to those who have not yet received it.