The incessant need to justify ourselves is tiring and many times, fruitless.
It isn't that you give up on claiming what's yours. Certain areas of our life would crumble and dissolve if we stopped fighting for them. But this notion that we have to be right all the time has to end. "For not he (and she) that commendeth himself is approved, but whom the Lord commendeth." (2 Corinthians 10:18)
There are times you need to speak up. I received a ticket once for a non-descript reason and watched in the courtroom as facts were skewed and the story was told from another (false) perspective. The resulting fine was nothing compared to the fact that I felt royally taken-advantage-of. I remember riding my bike home (as opposed to driving) feeling about this big. Lesson learned. Well, that, and don't do anything approaching the reason I was pulled over (it's complicated). Needless to say, I will be more assertive (politely) next time.
But this other thing. This notion that we know best and that the world needs to listen and subsequently change is unwise in the extreme. One of many watchwords with reference to the imposing of our wills and opinions of others, especially the Christian life, comes this verse from Romans (14:4a): "Who art thou that judgest another man's servant? to his own master he standeth or falleth..." But consider that verse in light of this one from Paul's first letter to those in Corinth: "Wherefore let him that thinketh he standeth take heed lest he fall." (1 Corinthians 10:12) The two go hand in hand. We are living unto God, but if we think we're meant to do it all on our own (which necessarily entails that we must prop up anything that looks to fail), then we will fall. It can't be helped.
The third verse of the first chapter of Hebrews says that "[Jesus] upholds all things by the word of His power." That includes everything that concerns us (whether it's cause for concern or not). Every slight, large or small. Every time we're disrespected, when someone doesn't "get" us. We walk around thinking we're the nice guy (or girl) and someone seeks to step on us without even thinking. Admittedly, God might have us say something in return. But if He doesn't, He'll give us the inward peace and confidence knowing that our case is before Him. David's Psalms are replete with expressions of prayer and concern that he be avenged and paid back. But "ye have not yet resisted unto blood, striving against sin." (Hebrews 12:4)
Look at Jesus: "Who, when He was reviled, reviled not again: when he suffered, He threatened not: but commited Himself to Him that judgeth righteously:" (1 Peter 2:23, emphasis mine) It's referring to God the Father.
The burden of retaliation and justification is too much for us to bear on our own. One way to instantly ease the pain of having been hurt is to know that the offense is aimed at the God you represent. So don't take it personally. Forgive me for being blunt, but it's not about you and them, it's about them and God. Trust. God will work it out for you and until then: "rejoice, inasmuch as ye are partakers of Christ's sufferings; that, when His glory shall be revealed, ye may be glad also with exceeding joy." (1 Peter 4:13)
God bless you.