What's the best way to deal with this? I realise that mostly it's parroted - I just overheard him impatiently tell DH to 'just finish the book' when DH was just commenting on a picture.
I now say 'that was very rude and it doesn't make me want to help you' about fifteen times a day but the attitude keeps coming. Obviously persistent rudeness results in a sanction.
I worry about him starting school and speaking to teachers like this :(