Not true at all. Nate asked for a 165lb catch weight for the first fight, being that it was short notice.
Nate asked for 155 for the second fight
You're wrong. He first agreed to 155 but wanted more money.:
http://espn.go.com/mma/story/_/id/14840361/ufc-196-conor-mcgregor-nate-diaz-fight-opponent-matter
Speaking to ESPN.com, Diaz did go more into detail on how the 170-pound fight was made. He said he was originally willing to drop to 155 pounds, but prolonged negotiations and other circumstances eventually had him standing firm at 165. McGregor ultimately suggested the bout simply be fought at 170.
"The first day [UFC] called and said it was going to happen, I was like, 'All right, I'm going to go work out and try to get this weight down,'" Diaz said. "I agreed to 155. I went through a hard day of training. I stopped eating. I had a mission ahead of me.
"Later that night, several things were going on. UFC said, 'If you don't take the fight under these circumstances, we're not calling back.' I said, 'If you aren't calling me back, I'm going to dinner, and things will be different tomorrow.' They called the next day, and I'm like, 'All right, now I'm only fighting at 165, and that's your fault.'
"I don't have the sparring you need for a fight. Now I'm going to deplete myself, too? I was with it, then they started messing around with the whole situation."