I'm convinced that 4 is the new 2

Who ever said that the 2's were terrible must not have had a 4 year old.  My once sweet little boy turned 4 and all hell broke loose.  He is a force to be reckoned with, and thats putting it lightly.  How do children learn how to talk back, thats all I want to know?  We don't talk to him like that.  Do we?