Being a disciplinarian does not make a coach mean.
Disciplinarians do get more out of the team than a players coach does. Sometimes being a disciplinarian means you yell. Sometimes to get over all the noise people have to yell to be able to hear each other too. A coach that is a disciplinarian that rewards his players and of course they win will actually be more appreciated by his players in the long run.
To me it is like Dad=coach and players=children in a relationship.