when the women discuss Mrs.wrights quilt , why do the men laugh ?

When the women discuss whether Mrs. Wright intended to quilt or knot it, the men laugh. The quilts are a symbol of love and warmth, both of which Minnie lacked, and her faulty stitching on the last section of the quilt suggests her breakdown in her attempt to create order out of metaphorical scraps. Of course all this is lost on the men, they feel the quilt represents nothing but a woman's hobby.