Labour leader says the Conservative Party is now the "political wing of the flat-Earth society".
Social media thought it was an "absolute disgrace" and "truly disgusting".
Labour leader targets prime minister's work as a hedge fund manager during fiery PMQs.
Labour leader laughs at Tory MPs being in "open revolt" against the prime minister.
"You couldn't make it up," one person commented on X.
"New Year, new nonsense."
A screengrab of the snarling prime minister has gone viral.
The home secretary has denied the allegation.
Labour leader accuses the Conservatives of "13 years of cutting corners and botched jobs".
Meanwhile, the PM still faces backlash over the delay of LGBTQ+ conversion ban.