Scientist Richard Dawkins said he suffered a "tsunami of hate" after he tried to make a point by describing some instances of rape as worse than others on Tuesday.
The prominent atheist and author provoked angry responses on the social media site after a series of tweets comparing assaults.
"Date rape is bad. Stranger rape at knifepoint is worse. If you think that's an endorsement of date rape, go away and learn how to think," the biologist tweeted.
"Mild pedophilia is bad. Violent pedophilia is worse. If you think that's an endorsement of mild pedophilia, go away and learn how to think."
"Mild date rape is bad. Violent date rape is worse," he later said.