Is it proper grammar to say 'no I never'?

Answer 1

It is correct if you use the proper punctuation. For example, it is correct to say, "No, I never told Rick that you lied about where you were Tuesday night."

Answer 2

The phrase "No, I never" is considered grammatically correct. It is a shortened form of "No, I have never" or "No, I did never." It is often used for emphasis in informal speech.