Story highlights Twitter users felt BAFTA host Stephen Fry's "bag lady" joke rude and sexist

Stephen Fry wrote on his blog that Twitter is no longer fun

Fry: "Too many people have peed in the pool for you to want to swim there any more"

(CNN) Stephen Fry, host of Sunday's British Academy Film Awards, has quit Twitter after users of the platform criticized his on-air joke about costume designer Jenny Beavan being dressed like a "bag lady."

In a blog post, the British actor, writer and comedian said he was deactivating his account because Twitter has become a "stagnant pool" littered with scum and other hazards.

"Even if you negotiate the sharp rocks you'll soon feel that too many people have peed in the pool for you to want to swim there any more. The fun is over," he wrote.

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"Let us grieve at what twitter has become. A stalking ground for the sanctimoniously self-righteous who love to second-guess, to leap to conclusions and be offended -- worse, to be offended on behalf of others they do not even know."

Beavan accepted her BAFTA for costume design for "Mad Max: Fury Road" onstage at London's Royal Opera House while wearing slacks, a black leather jacket and a scarf over a white T-shirt.