I'm going to tell someone I'm not interested after they criticized my kissing style on the second date
Why do you want to do that?
I was reading on the Internet that this is the best way to cut someone off.
It can be hard to have someone criticize you. It might mean you're not a good fit, and that's fine. If you like them otherwise though, maybe you could find a kissing style that works for you both, but it's not right to just walk away with no explanation.
I know, I just hated being criticized so much by her. Even if she was just trying to teach me something.
I understand that you feel the pain of being criticized, but disappearing and not talking to this person is not the right way to handle things. Why don't you simply ask her what she was trying to point out and see if she could help you with your kissing?