Scripture admonishes us to love each other, but I don't believe we'll necessarily like everyone or work well with everyone this side of heaven.
1. Some Christians are immature. We can only do our part (Romans 12:18).
2. We're all "working out our salvation." It's a process (Philippians 2:12-13).
3. Life is complex. The Bible gives principles, not detailed steps for every situation (Romans 14).
Last year I wrote an acquaintance to ask forgiveness for a situation where I behaved badly. When the situation occurred, I thought I'd done the right thing. Time, maturity, and prayerful self-examination showed me I was wrong and needed to apologize to this person.
Sanctification is a process. If we aren't growing and seeing our sins more clearly, we need to seek God more fully. But it's unrealistic to think we can solve all relationship problems this side of heaven.