An MSNBC contributor and editor of "The Root" called out "racist white boys" who support Sen. Bernie Sanders (I-Vt.) and his campaign fired back on social media.
Johnson was explaining his MSNBC debate with Nina Turner, a Sanders campaign official, about whether it is political useful to criticize candidate Mike Bloomberg by calling him an "oligarch," when he made the comments.
"A large number of bargain basement pathetic doubly intensely ignorant bigoted white boys who masquerade as liberals who find themselves consistently in support of Bernie Sanders online have decided that they want to make this part of their meme," Johnson said.
"I do find it fascinating that racist, liberal whites seem to love them some Bernie Sanders consistently," he added. "And always have a problem with any person of color who doesn't want to follow with the orthodoxy of their lord and savior Bernie Sanders."
Johnson went on to explain several moments from the Sanders campaign where he felt they thumbed their nose at black journalists and other African-Americans.
"He cares nothing for intersectionality. I don't care how many people from the island of misfit black girls you throw out there to defend you on a regular basis, it doesn't mean that your campaign is serious!"
The hosts appeared aghast at his comments, and jokingly chided him, saying that he had gone too far.
"I don't care!" he responded. "I don't care."
Briahna Joy Gray, the national press secretary for the Sanders campaign, responded to an edited clip of the exchange and accused Johnson of "open racism and sexism" in a tweet.
"I hope we can have political disputes without engaging in open racism and sexism," she tweeted. "This misogynoir is disappointing, but not surprising from @DrJasonJohnson. I hope we can all encourage each other to be better."
Sanders is considered the frontrunner of the Democratic primary campaign after the results in the Iowa and New Hampshire contests.