Why is thersites upset with Agamemnon and how could his concerns be addressed and resolved?

The conflict between Agamemnon and Achilles occurs over a woman named Briseis. Both Agamemnon and Achilles are awarded a woman as a trophy of war, but when Agamemnon is forced to release his captive, Chryseis, he decides that he is entitled to Achilles's captive, Briseis.