This is said. It really is.
In 2013 Senate Democrats changed the filibuster rules on most of Obama’s nominees, allowing them to get approved by a simple majority, but left the 60-vote hurdle intact for Supreme Court nominations. http://thehill.com/blogs/floor-action/senate/302513-reid-dems-could-change-rules-for-supreme-court-nominees
The article is about Reid threatening to it later, but he never did.
From a more conservative source.
Democrats opened Pandora’s Box on the nuclear option in November 2013 when they held the majority in the Senate. Senate Democrats didn’t have 67 votes to change the Senate rules. But then-Senate Majority Leader Harry Reid, D-Nev., enacted a new precedent of how many votes are necessary to extinguish filibusters on executive branch nominees except Supreme Court picks. http://www.foxnews.com/politics/2017/04/03/what-is-nuclear-option-roadmap-to-how-gorsuch-confirmation-could-play-out.html
Yea, you looked real hard.