An individual can be defined in numerous and varied ways. Mostly though, people are grouped in broad strokes within generic categories. This clumping of comparable types, behaviors, etc., serves only to satisfy the like/dislike, positive/negative mentality of mass media. It makes it genuinely easier to foist limited views upon a greater population. Very productive as far as profits and propaganda are concerned, but not very useful in terms of actual quality interaction.
People of intelligence, with the ability for rational thought, know that no two people are truly alike. A person's character, personality and mindset can be and are as unique as one's fingerprints. Given a set of circumstances, will two individuals endeavor to reach the same consensus, the same conclusions? Or will they debate the issue interminably from opposing sides? Can an individual with lesser intelligence be able to grasp the necessary knowledge to comprehend and proceed with what is laid out in front of them?
To really know any one person, must you really walk in their shoes? Is it necessary to share in their travels; be able to sense the direction and tone in their words? Complex questions, no? There is so much more to being human than mere intelligence. A healthy dose of compromise and empathy is also recommended; and in the midst of a supposed rational debate, it is respect that will conquer an inevitable animosity.
In the end, it is about valuing other's opinions as much as you would want them to respect your own.