The idea that “I’ll believe what I want to believe” and “you believe what you want to believe” can sometimes lead to the avoidance of truth. You should seek to understand the viewpoints of others whether you agree or disagree. Getting to know someone better provides you the opportunity to build upon the things you mutually share or agree on, instead of putting all your energy into disagreeing.
Many conflicts are created to make people look good. Whenever you see people arguing as if it were intellectual combat, the nature of the argument can be grossly misunderstood and/or overshadowed by the person with the loudest or most convincing delivery. Don’t take someone agreeing or disagreeing with you personally, but be willing to keep an open mind if the argument has good merit.