[56a bottom] R’ Nassan did not argue with the Rabbis until a later part of the Mishna because he let the rabbis continue speaking until they finish their statements.
Shar Mitzyonim Behalacha: Pirkei Avos: One of the Midos (traits) of a Chacham (wise man) is he who does not interrupt others.
Prac-T-cal Tidbits: It is important when conversing with another to let the other person finish his/her statements before we respond or try to argue. Make sure to allow others to say what they want to say before we interject. We must always have proper honor and respect for others.