This is a genuine Christian quality, no one can show a longsuffering attitude if they aren't involved with the Holy Spirit, because being longsuffering means ENDURING OFFENSES.
It's not a self control from our human nature that makes us be longsuffering (patient), the revelation of this fruit is not this way, but the direct actions of the Holy Spirit inside a person that's makes them produce a patience to tolerate aggressions that society imposes on us, because with don't mingle with it corruption... only those who've been through the new birth have this ability. Let's meditate on the importance of this fruit:
The Lord Jesus what put through fire of those who hated Him, trying to provoke him to react in the same manner, which is what those people to do those, who because of love, strive to win them for eternal life.
There lies the true meaning of longsuffering. Meanwhile the world succeeds, it strives and fights with all its might to destroy us, we struggle with all our might to save it.
Non-Christians cannot handle offenses with patience, only if there's a reason for them in their yes... but the Christian is able to handle ALL and whatever kind of injustice and still, he remains strong and longsuffering.
The race is not always of the fastest, nor the battle of the strongest. The race is won through patience, by learning to walk with God, step by step.