Thinking or feeling can often be a source of conflict in communication. Both of these behavior preferences describe rational decision-making processes. It is not that thinkers don't have feelings, or that feelers are incapable of logic. It is just that they use very different criteria to make their decisions.
If you're presenting INFORMATION to a potential customer, how do you determine what strategy is best? Should you joke around, stick to the facts, or make small talk and cut to the chase? The right approach can mean the difference between getting your ideas across and getting your signals crossed.
People are different. We think, act, and process information differently from each other. We all know this, but why and how we're different is less obvious. This often results in personality clashes. Our personality type is encoded in our DNA, just like our preference for being either right-handed or left-handed.