The group linked to an article about Rittenhouse's interview with Fox News's Tucker Carlson. In it, Rittenhouse said: "I'm not a racist person. I support the BLM movement. I support peacefully demonstrating."
In response, BLM tweeted, "Alexa play: I don't f--k with you," and a gif with the acronym "IDFWU." It was citing the Big Sean song bearing that title.
Rittenhouse was recently acquitted of all charges related to his conduct during a racially loaded protest in Wisconsin last summer. The judgment has urged left-wing commentators to suggest another victory of White supremacy within the justice system.
In another tweet, BLM described Rittenhouse as a "little racist/terrorist" who "represents the exact kind of white-supremacist vigilante violence that we've seen before."
"This case has nothing to do with race. It never had anything to do with race. It had to do with the right to self-defense," he said.
A jury cleared Rittenhouse of charges of homicide, attempted homicide, and reckless endangerment on Friday in the deaths of Joseph Rosenbaum, 36, and Anthony Huber, 26, and the wounding of Gaige Grosskreutz, 27, on Aug. 25, 2020.
He was 17 when he brought a semi-automatic rifle and a medical kit to Kenosha in what he said was an effort to protect businesses as riots broke out over the police shooting of Jacob Blake, a Black man who was left paralyzed from the waist down, on Aug. 23.
His attorneys argued that the teenager acted in self-defense when he opened fire.
Rittenhouse stressed under cross-examination that he had no other option other than to protect himself and claimed the protesters were a threat to his life.
"I tell everybody there what happened. I said I had to do it," he said. "I was just attacked. I was dizzy, I was vomiting, I couldn't breathe."
The high-profile case generated debate over whether Rittenhouse used his legal right to use weapons during the violence in Kenosha or whether he was a dangerous vigilante who aggravated the situation.
"I believe they came to the correct verdict, and I'm glad that everything went well," he said.
"It's been a rough journey but we made it through it. We made it through the hard part."
The jury deliberated for close to 3¹/₂ days before reaching a verdict. Rittenhouse spoke against his prosecution but said he believes his treatment was not unique.
Legal experts told The Post that prosecutors in the trial presented an overly complex case and might have had better success if they had sought lesser charges.