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It is important to understand that other people's perceptions of you may be far, far removed from what you intend to convey, particularly in times of stress. Different behavioral styles have very different ways of seeing the world; and frequently, what is intended by one person's behavior is not judged the same way by another. This is fertile ground for misunderstandings; they make an already-burgeoning conflict even worse.
When you perceive somebody in a negative way, it often determines how you will interact with them. In a team, the same behaviors and negative reactions can happen over and over again and cause team-members to form negative perceptions of one another. If these daily misunderstandings and clashes are allowed to persist between two people over time, without ever being addressed, they can cause those people to lose respect for one another - and that is the worst thing that can happen in a team.