O'Neill claimed that referee Mike Riley had missed a foul on Ashley Young in the lead up to Manchester United's late winner scored by Federico Macheda.
The Northern Irishman also questioned the decision to allow five minutes added time and claimed that the officials had got at least three offside decisions wrong.
However, the F.A. must realise that the comments were made in the heat of the moment by a manager who had just seen his side surrender a 2-1 lead in the space of just ten minutes.
But, as any fan knows, English football's governing body are unlikely to take this into account when considering their punishment of the Villa manager.
The Claret and Blue were on the verge of their first win at Old Trafford since 1983, but goals from Cristiano Ronaldo and Macheda put paid to hopes of a vital victory.