The remark by Twitter user Rileyy_69 cut to the quick.
Daley reacted angrily, reports The Daily Mail after his apology for a fourth placing yielded the 'You let your dad down' response.
Daley immediately re-tweeted the abuse saying: "After giving it my all...you get idiot's sending me this" prompting a host of complaints from his fans.
But Rileyy-69 persisted: "Hope your crying now you should be why can't you even produce for your country".
Eventually, Rileyy_69 was bombarded with complaints, backing down and apologising to Daley.
"I'm sorry mate i just wanted you to win cause its the olympics I'm just annoyed we didn't win I'm sorry tom accept my apology," he tweeted.
It's just one of a host of controversial tweets this Olympic Games.
COMEDIAN SAYS SWIMMER HAS 'DOLPHIN'S FACE;
A controversial comedian, Frankie Boyle, took to Twitter to mock British Olympic swimmer Rebecca Adlington.
"I worry that Rebecca Adlington will have an unfair advantage in the swimming by possessing a dolphin's face," Boyle tweeted.
Adlington became a double gold medal winner at the Beijing Olympics in 2008.
SWISS FOOTBALLER EXPELLED FOR RACIST TWEET
Meanwhile, a Swiss footballer has been expelled from the Olympics for his threatening and racist message on Twitter in the wake of the Swiss team's loss to South Korea.
Michel Morganella said in the tweet that South Koreans "can go burn" and referred to them as a "bunch of mongoloids".
Morganella "discriminated against, insulted and violated the dignity of the South Korea football team as well as the South Korean people," Swiss Olympic team chief Gian Gilli said through a translator at a news conference. He said the player was stripped of his Olympic accreditation, reported the AP.
He has since apologised, saying: "After the disappointing result and the reaction from Korea that followed, I made a huge error".
Gilli said the player had been "provoked" by comments sent to his Twitter account after the match.
GREEK TRIPLE JUMPER EXPELLED FOR RACIST TWEET
The Swiss footballer Morganella is the second athlete kicked off a London Olympics team for offensive Twitter comments, following Greek triple jumper Voula Papachristou.
Papachristou was kicked off Greece's Olympic team for her comments on Twitter mocking African immigrants and expressing support for a far-right political party, reported the AP.
Papachristou's Twitter account (@papaxristoutj) contained several re-tweets and links to sites and YouTube videos promoting the views of Golden Dawn, a formerly marginal extreme right party that entered the Greek Parliament in two recent elections.
She has since erased those links and re-tweets from her account.
But it was her attempt at a joke that got the most attention. Commenting on the widely reported appearance of Nile-virus-carrying mosquitoes in Athens, Papachristou wrote: "With so many Africans in Greece, the West Nile mosquitoes will be getting home food!!!". Her tweet prompted thousands of negative comments.
After the uproar, the Hellenic Olympic Committee announced that it had banned all Greek athletes from using social media to express any personal opinions not related to the Olympics and to the preparation for their competitions.
"What we did after this is was to ban all statements on social media (such as) Twitter and Facebook, that are not related to the games. They can't express personal opinions on other, third subjects, but only about themselves, their athletic condition, if they're on form, or about the games, until the games are over," Hellenic Olympic Committee spokesman Tassos Papachristou told The Associated Press in London. The spokesman is no relation to the athlete.
Nevertheless, the Olympic spirit - positive and negative - is being captured 140 characters at a time.
- Herald Online