No true Christian should be arrogant or proud -- not if they understand what the Bible says. Pride is a sin in the eyes of God, and the Bible says it even cuts us off from Him. The Bible warns, "The Lord detests all the proud of heart" (Proverbs 16:5).
Why shouldn't Christians be proud? One reason is because we can never claim to be perfect. No matter who we are, we're still imperfect and sinful in God's eyes. Furthermore, we know we are saved only because of God's grace and mercy, and not because we're better than anyone else. Humility and gentleness should be the marks of anyone who seeks to follow Jesus, not pride and arrogance. The Bible says, "It is by grace you have been saved, through faith... so that no one can boast" (Ephesians 2:8-9).
My real concern, however, is that you would look past the failures and faults of some who may have offended you, and look instead at Jesus. Have you ever done that? When you do, you'll discover a truth that could change your life: God loves you, and He wants what is best for you.
Don't center your life on yourself, constantly demanding to have your own way. If you do, eventually you'll find you're on a dead-end road. Instead, face honestly your need for God, and open your heart and life to Jesus Christ. He'll not only forgive your past, but He will give you a whole new purpose in life.