Arsenal manager Arsene Wenger has vowed to fight a charge of improper conduct by the Football Association and requested a personal hearing.
Wenger was charged by the FA after hinting that Ruud van Nistelrooy cheated during the Gunners' recent 2-0 defeat at Old Trafford.
But he said: "I'm not upset. I don't really know what I'm charged with.
"I have read my statement again and I stand by what I said. I didn't say he is a cheat."
He added: "To have gone through everything that happened that day and for just me to be charged, you must have a good sense of humour.
"I don't think that you should be allowed to say anything you want. But you shouldn't always be politically correct on everything.
"At some stage, you have to say what you think, as long as you don't insult people.
"For me, given what happened that day, I don't think what I said was exaggerated. I just said what I felt and it's as simple as that."
Van Nistelrooy has served a three-game ban after a challenge on Ashley Cole in the game on 24 October.
Wenger also criticised referee Mike Riley following a fiery encounter.
Riley incurred the wrath of Wenger after awarding United a penalty for Sol Campbell's challenge on Wayne Rooney.
Arsenal's defeat to their rivals ended the Highbury side's record 49-game unbeaten run and there was an alleged tunnel incident after the match.
United boss Sir Alex Ferguson was alleged to have been hit by food thrown by an Arsenal player.
Wenger's personal hearing with the FA will be held on 16 December.