The Spurs boss wasn't too pleased after a missed call awarded Arsenal a corner kick, followed by a goal, to spark the Gunners' north London derby comeback.
After the 2-1 defeat to Arsenal in another hotly contested North London derby that got away, Tottenham manager Ange Postecoglou cut a dejected figure.
Heung-Min Son gave Tottenham the lead against the run of play but Dominic Solankes own goal and Leandro Trossards strike turned it around as Arsenal narrowed the gap on Premier League leaders Liverpool;
Tottenham boss Ange Postecoglou knows how much the north London derby against Arsenal means to the club.
Ange Postecoglou bemoaned Tottenham's loss record after they fell to another North London derby defeat, calling their 11 defeats this season "unacceptable".
Following a north London derby, where Arsenal moved to within four points of Premier League leaders Liverpool and Tottenham moved closer to the relegation zone than the top four.
Tottenham manager Ange Postecoglou has branded his side's performance against Arsenal "not acceptable" and admits the "responsibility lies with me" for their 2-1 defeat
Tottenham boss Ange Postecoglou laid the blame at his own door after watching his side lose the north London derby against Arsenal. The Lilywhites took the lead midway through the first half but were behind by the break. And they couldn't fight back as Arsenal clinched a 2-1 victory.
Ange Postecoglou is coming under pressure after the North London Derby defeat to Arsenal left Tottenham sitting just eight points above the Premier League's relegation zone
Arsenal closed the gap on Premier League leaders Liverpool to four points after a four-minute first-half turnaround
Tottenham fans have reacted on social media after Ange Postecoglou's side lost the North London derby at Arsenal.
Spurs' poor derby ... north London Derby on Wednesday night. The result leaves them closer to the relegation zone than the top four – things are going from bad to worse for Tottenham and Ange ...