The center back mocked his rival over a lack of playing time this season, and the jibe was noted by the Bernabeu idol who labelled his behavior 'outrageous'.
Former Real Madrid captain Guti is fed up with Gerard Pique's off-field antics, slamming the outspoken Barcelona defender for unprofessional behavior on social media.
Pique and Madrid fullback Alvaro Arbeloa have played out a public spat for much of the season and the feud reigned following Barca's 1-0 defeat to Real Sociedad last week.
After Arbeloa commented on Barca's surprise loss on Twitter, Pique mocked the 33-year-old's role at Madrid, insisting "a player who has started once in 32 games doesn't deserve a response".