never vs oh really

never

• A statement of defiance 

• Negative particle (used to negate verbs in the simple past tense; also used absolutely). 

• At no time; on no occasion; in no circumstance. 

• Not at any other time; not on any other occasion; not previously. 

oh really

• Said in response to an obvious statement. 

• Used other than figuratively or idiomatically: see oh, really. 

• An exclamation of surprise or amazement.