Come on. Mario was a diva.
[This was kind of like when Arsene had Ozil play on the left to accommodate Santi and/or Ramsay, and Ozil decided to be more of a diva than he normally is and pull a Mario as a form of protest].
In either case, that is a BS tactic by the player - especially when they are getting paid millions and millions of dollars (pounds).
By the way, remind me again how many times Mario dropped back in coverage and how many total snaps he played last year?