Final answer:
The male-chauvinist boss quickly reverts to his earlier sexist attitudes because of long-standing habits.
Step-by-step explanation:
The reason why the male-chauvinist boss quickly reverts to his earlier sexist attitudes is because of long-standing habits. Habits are automatic behaviors that are deeply ingrained and difficult to change. Even if the boss vows to change his attitudes, his long-standing habit of being sexist will likely override his intentions.