Mourinho mocked home fans after Manchester United's Champions League win in Turin.
“Mourinho's gesture overshadowed Manchester United's win, which came in a game that was important for him and the team," the ex-Nerazzurri owner told Calciomercato.com.
“It's part of his character. When he returns to Italy he finds all his feeling and experience, which leads him to react as if he was still here, while also thinking about the club he was at [Inter] and those who antagonised him.
“That puts him in a position to make certain gestures at certain times, which create situations of discussion that, in football, are fun and interesting to watch.
“It shouldn't offend anyone. Am I surprised when he says 'my Inter'? No. It's precisely for this reason that he reacts the way he does.
“Inter in the Champions League? They have character and depth. Zhang as President? He's a good lad and he'll do very well."