United manager Sir Alex Ferguson hit out at the Chelsea defender for getting Rafael sent off at Old Trafford as the Blues picked up a 1-0 win at Old Trafford on Sunday.
However, both the Times and the Independent report that Luiz has said in private that he was just reacting to a fan in the area who had been comparing him to the famous evil villain from The Simpsons cartoon.
The Independent reports that: "It will certainly not be the first time he has heard the comparison with Sideshow Bob and he has said that his response was merely good-natured and an acknowledgement of the remark directed at him, rather than part of a more devious act."
While the Times adds: "Luiz’s long, curly hair bears a resemblance to that of the cartoon character from The Simpsons, to the extent that a Facebook page has been set up entitled “David Luiz is Sideshow Bob."
However, Ferguson said after the match that Luiz's play-acting had been instrumental in the referee issuing a red card, and that it was an unwelcome trait in non-British players.
"The ref has been bought by the fact Luiz is rolling about," he said. "But whether the ref will do anything about it, I doubt very much. When a player retaliates he gets punished the most. Luiz rolled about. You see that with these European, foreign and South American players.
"He [Da Silva] retaliates but Luiz quite clearly elbows him twice, then rolls about like a diving swan and that convinces the referee. He was smiling. It's bad. What kind of professional is that? He [Da Silva] was elbowed and he retaliated. That's what always happens, the player who retaliates always gets the bigger penalty and it was clear that Luiz elbowed him twice."
Eurosport blogger and former Liverpool star Jan Molby said that initially the incident looked bad but when you thought about, there was no way Luiz laugh could have been motivated by a desire to get Rafael sent-off.
"I admit that as I watched it live I instantly thought: 'I don't like that,'" he wrote in his latest blog.
"However, then when you think about it, he's on the ground smiling before a red card has been shown, he's not laughing or winking, thinking he has got a man sent-off.
"I look at David Luiz and I see an inoffensive character – he plays on the edge at times but I don't think he is a bad guy and I just can't buy that he was lying on the floor thinking: 'I've got what I want from this situation, as Rafael is about to get sent-off.'"
"I refuse to believe that is why he was laughing – there is a culture of anger in football at the moment and people always look to jump to the worst conclusions."
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- David Luiz
- Sideshow Bob