Final answer:
One major criticism of Tannen's genderlect theory is that it took a unidimensional approach of studying gender differences in communication. Research suggests that gendered ways of speaking are cultural, not biological.
Step-by-step explanation:
One of the major criticisms of Tannen's genderlect theory is that it took a unidimensional approach of studying gender differences in communication. The theory generalized that men and women have entirely different communicative subcultures, with men using conversation to assert their status and women focusing on building solidarity. However, research challenges this view and suggests that gendered ways of speaking are cultural, not biological.