In addition to the great links ppl already posted below:

What's so bad about George Orwell?

• He's antisemitic, homophobic, and racist. Specifically, he snitched out Jews, Black people, Homosexuals, and communists to British Intelligence. His list, here, includes him writing:
  • 8 variations of “Jewish?” (Charlie Chaplin), “Polish Jew, (Tom Driberg)” “English Jew,” or “Jewess.”
  • Paul Robeson - "ROBESON, Paul (US Negro) ...Very anti-white. [Henry] Wallace supporter."
    • Paul Robeson wasn't anti-white, just look at the welsh coal miners for whom Robeson Campaigned.
    • The testimony of Paul Robeson (one of the people Orwell snitched on), to HUAC (House of Unamerican activities committee) during the red scare.
  • Stephen Spender - "Sentimental sympathiser... Tendency towards homosexuality"
  • Hugh MacDiarmid, Scottish nationalist poet, and anti-imperialist.
  • George Padmore, Trinidadian journalist and anti-imperialist campaigner.
• His books Animal Farm and 1984 are used widely as anti-communist propaganda in schools in the US and UK. So much so that his animated animal farm film was funded by the CIA. There's a reason they teach George Orwell in schools and not Franz Fanon, Che, Huey P Newton, Malcolm X, Lenin, CLR James, etc.
• In 1941, illustrator Elias Gertrude approached Orwell, then an editor for the British Ministry of information, with an idea for a satirical cartoon film, portraying the Nazis as pig characters ruling a farm in a kind of dysfunctional fairy story. He told her that there was not much call for her idea, stole it, changed the name from A Fairy Story to Animal Farm, and changed the pig-nazis into Communists.
• Between 1952 and 1957, from three sites in West Germany, a CIA operation codenamed ‘Aedinosaur’ launched millions of ten-foot balloons carrying copies of George Orwell’s Animal Farm, and dropped them over Poland, Hungary and Czechoslovakia — whose airforces were ordered to shoot the balloons down..
• Orwell, anti-communist: A criticism of Orwell and his Work - By Isaac Asimov.
• Orwell - "I have never really disliked Hitler."
• He attempted to rape one of his first courtships: "Previously the young couple had kissed, but now, during a late summer walk, he had wanted more. At only five feet to his six feet and four inches, Jacintha had shouted, screamed and kicked before running home with a torn skirt and bruised hip. It was "this" rather than any gradual parting of the ways that explains why Jacintha broke off all contact with her childhood friend, never to learn that he had transformed himself into George Orwell."
• Redsails - On Orwell.
• Orwell worked as a British imperial cop in Burma for 5 years. His short story, Shooting an Elephant, uses ethnic slurs and denigrates burmese people.
• A reddit thread on George Orwell, Thread #2.