You have to decide what battles are worth fighting. Dealing with the Cowardly Lion means you have to stop whining. As you become more of a self-starter, you'll learn that working for a Cowardly Lion can be more rewarding and fulfilling than working for a Lion King. And most important for your own growth, you find out where your convictions and your comfort zone intersect. The Boss Carries an Ax Bosses often have to be demanding, brusque, impatient.
Bosses have to set high standards, make tough decisions, push the organization.
Working for a boss who's tough on purpose can teach you lessons you'd never learn any other way. A Tin Man also teaches the value of mental toughness. Finally, working for a Tin Man is an introduction to the passion of business. While a Tin Man may not always have a heart for the people around him, he almost always has an inextinguishable commitment to the business. I saw this in the middle of my career, when a new boss took over as a change agent for our smugly satisfied organization.