obtusnoxious
Someone who is so dumb and so rude you want to punch them and also feed them a dictionary.
He told me I was ugly. I told him he was a moron. He said, 'What’s a moron?'
I explained the rules of the game. He ignored me and kept cheating. I called him obtusnoxious. He said, 'What’s that mean?'
He called my dog fat. I said, 'Your brain is fatter.' He said, 'I don’t know what that means.'
xs