Arsene Wenger lashed out at his critics after Arsenal fans chanted "you don't know what you're doing" toward the end of Saturday's goalless draw at Aston Villa.
Wenger refused to comment on that outburst or why he made the change, but he was in a fighting mood when asked about the chants in his postmatch press conference.
"I don't want to comment on that. I do my job and do my best for the club," he said. "I leave it to you to judge. I try to be as good as I can be. Is it hurtful? Look, I have managed for 30 years at the top level and I have to convince you I can manage the team?
"How many games have you managed? I promise you if you manage one, I will sit in the stands and chant, 'You know what you are doing!' "
When questioned about the substitution, Wenger said: "You can discuss every substitution. You think what you want. I do my job and I let people judge it. I do that every day and I do my best every day. I know why I do it.
"What is the thinking behind the substitution? I will not explain every decision I make, you judge the game for the papers and I sit here and explain to you our game. You are all great managers! I read the newspapers every day and I can tell you that you are always great managers!"
Wenger denies his reluctance to explain his substitution will cause a rift with Gunners supporters.
"Why should I create a rift? I have given you the answer," he said.