The Australian has lost his first two games in charge, including a Carabao Cup defeat at Swansea City.
On the negativity, Postecoglou said: “I’ve no idea why. I’m likeable! There’s been a negativity around my arrival since I came to the Premier League.
“But it’s a curious study in human nature as to why that’s the case. I came from Scotland and I get there’s not a great deal of respect given to the game up there.
“But my first year at Tottenham, I went to a club that finished eighth.
“They lost their greatest-ever player in Harry Kane and I got them fifth playing my style of football.
“It would’ve got them to the Champions League any other year.
“But unfortunately, that first year I had somehow doesn’t exist. All that shows was that I finished in a poor position last year — and that my football ‘doesn’t work’.”