What type of communication is the least effective when rapport is needed?

An aggressive tone is the least effective type of communication when building rapport because it tends to create a barrier between individuals rather than foster connection. When someone communicates with aggression, it can instill feelings of defensiveness or fear in the listener, making them less likely to engage openly or authentically in the conversation. Rapport relies heavily on trust, empathy, and understanding, which an aggressive manner directly undermines.

Conversely, formal language, the use of first names, or casual language can all serve different purposes and contexts in communication. Formal language might establish professionalism, while casual language can create a friendly atmosphere. The use of first names can also help humanize the interaction and promote familiarity. However, an aggressive tone disrupts the foundation required for building rapport, leading to a breakdown in communication rather than an enhancement of relationships.