Take for example washing dishes, say there are some dishes that hasn't been washed on a Sunday night so they obviously need to get washed on the Monday. Monday morning the man get up and gets ready to go to work, the woman is at home the Monday. Man goes to work and comes home after work. The woman was at home, washed the dishes from the night before. The man does not necessarily say thanks for washing the dishes as it is something that needs to be done, in some previous instances he did say thanks. At times however he had a busy frustrating day at work, being preoccupied with things that happened at work, he forgets to say thanks. The woman is expecting a "Thank you" everytime and makes a big deal if a "Thank you" was not given. Where as if the tables where turned the man would not make a big deal as it is something that needs to happen regardless of getting a thank you or not.