Many of the people who glibly toss around the “disruptive” technology or innovation phrase are a lot like the people who toss around the “Kabuki theatre” phrase. The speaker or writer is usually unable in either instance to explain exactly WHY something is disruptive or Kabuki, or even “ish.”
The Harvard Business Review, December 2015 issue, may come to your rescue:
“What Is Disruptive Innovation?” by Clayton M. Christensen, Michael E. Raynor, Rory McDonald, HBR, Dec 2015
If that link ceases to work, here’s the article’s Wayback Machine URL.