The Swedish striker has scored 22 goals in 23 Ligue 1 appearances for the French giants so far this season, but has struggled to perform to his best in recent matches.
"He has scored 22 goals and provided four assists in the league," Leonardo told AFP. "Since the winter break he has scored four times. He is involved in every decisive and important move, but it is not possible to be in your best physical condition for 10 months.
"You can't judge his season just on his recent performances. When I hear people talk, commentators, pundits, I get the impression we annoy them.
"In fact, we are getting to exactly where we wanted to be. We arouse jealousy and it is better that than pity."
PSG are currently three points clear at the top of Ligue 1.