As you can plainly see, each fellow is right — and each is wrong — just depends on which side you’re standing on.
The lesson here is that each of us sees the same thing differently — we have different experiences, different lives, so we look at everything from a personal perspective.
So the next time someone says, “You’re wrong”, try this: Instead of defending your perspective, ask the person, “How do you see/understand it?”
You don’t have to agree with the person, but you will gain an insight into how they think, how they view things.
And, it’s very OK after listening to his views (and if you’re really savvy, paraphrasing what you heard), you can say, “That’s different from how I see it. The way I look at it is…”
You may be surprised at what you learn. A bonus here is that this approach is a very effective way to build a good relationship because neither of you was put on the defensive.