"That day [at UFC 207] was the day I had to prove to everybody and I did it."
Asked if the fight was easier than she expected, Nunes said: "Yeah, actually, my camp for Miesha Tate was harder than it was training for Ronda Rousey."
The brash champion, goaded on by the interviewers from TMZ, went on to say Rousey has been overrated for years.
"Yes, for sure," said Nunes. "UFC make this happen ... but I know that I could beat Ronda Rousey since I saw her first fight."
Nunes, now the undisputed queen of the bantamweight division, is on a five-fight winning streak that includes wins over Rousey, former champion Tate and current No. 1 contender Valentina Shevchenko.
Rousey has lost her last two fights in brutal fashion. In both losses, against Nunes and Holly Holm, Rousey's lack of boxing skill was clear to see, yet she seemed intent on trading punches with her opponents, both of whom are striking specialists.
Nunes was well aware of Rousey's weakness in the stand-up game and called out Rousey's controversial coach, Edmond Tarverdyan, for his game-planning.
"She thinks she's a boxer. He like put this in her head and make the girl believe in that," Nunes told Fox Sports.
"I don't know why he did that. She has great judo and then she can go more forward in this division, but he put some crazy thing about her boxing and then her career started like going down.
"That's why I went in there and I'm the real striker here. This is the only thing I want to look at him to say."