Chelsea's Jose Mourinho lacks respect for his fellow managers, says Arsenal boss Arsene Wenger.
Gunners fans chanted "boring boring Chelsea" during last weekend's 0-0 draw, and Mourinho said the Gunners' 11-year wait for a title was "boring".
Wenger was asked about those comments in his pre-match news conference for Monday's game with Hull.
"The biggest thing for a manager is to respect other managers. Some people have to improve on that," he said.
In February 2014 the Chelsea boss called his opposite number a "specialist in failure", and then in October the Gunners boss shoved his rival during a heated touchline quarrel.
Wenger said: "You can have incidents with other managers sometimes.
"It gets a bit heated when you fight directly with them, but in the end I believe time heals and the important thing is to respect each other as much as you can."