Why does Mrs. Thomas tell Bigger he is the most no-countest man I ever seen in all your life?

Mrs. Thomas tells Bigger he is the "most no-countest man" she has ever seen to express her frustration and disappointment with his lack of ambition and responsibility. She perceives him as someone who fails to take charge of his life or contribute positively to their family's struggles. This remark highlights the generational and societal pressures faced by Bigger, emphasizing the tension between his aspirations and the harsh realities of his environment.