A graphic tweeted by Dumisani Washington in response to Ali Abunimah's tweet.

An outspoken anti-Israel activist has found himself in the cross-hairs after comparing comments made by President Obama to white supremacist rhetoric.

Late last week, Ali Abunimah, the founder of the controversial Electronic Intifada blog, tweeted, “When Obama says Israel is in a ‘tough neighborhood,’ he’s echoing the white supremacist rhetoric that justifies the killing of Black men.”

Responding to the tweet in a Facebook post, Dumisani Washington, Director of the Institute for Black Solidarity with Israel, said Abunimah was himself guilty of racism.

“In typical Arab supremacist, African-hating fashion, Electronic Intifada founder Ali Abunimah compares ‘Black men’ to genocidal, misogynistic, child slaughtering jihadists like Hamas and Islamic Jihad,” Washington wrote, “Maybe he thought we were too stupid to notice.”

In an email to The Algemeiner Washington added, “Thank you, Mr. Abuminah for proving once again that there is no difference between White supremacists and Arab supremacists – right down to the enslavement and subjugation of Black people. Oh yes, go find your own narrative and stop trying to steal ours.”

Another African-American activist and commentator, Chloé Valdary, also took exception to Abunimah’s assertion.

Describing Abinumah’s comment as “extremely offensive,” Valdary told The Algemeiner, “Unless Abunimah doesn’t think racist bigoted organizations like Hamas and ISIS threaten Jews, he’s essentially justifying Arab supremacism by claiming that its victims are racists.”

“But in the same way blacks were threatened by white supremacists,” Valdary said, “Jews are also threatened by Arab supremacists. Abuminah’s inversion of reality and colonialist revision of history does not change that fact.”

Abunimah’s site has also been accused of anti-Semitism, specifically for frequently comparing “Israeli policies with those of the Nazi regime.”

Last Friday the controversial activist also seemed to voice support for the execution of alleged “collaborators” with Israel by terror group Hamas in Gaza.

“In every society war time collaboration is seen as the most heinous crime and mortal threat to resistance. Not unique to Palestine,” he tweeted.