The journalist mother of the singer Grimes appears to have lashed out at Elon Musk — the father of her new grandson — in a series of tweets.

Sandy Garossino tweeted — then deleted — criticism of the Tesla founder for “blaring [men’s rights activist] bulls–t on Twitter,” just weeks after Grimes gave birth to baby X Æ A-12.

Garossino’s comments followed Musk’s tweet on Sunday in which he encouraged his 34.3 million Twitter followers to “take the red pill” — a reference to a scene in “The Matrix,” which has become a heavily politicized meme often associated with hard-right causes, including men’s rights activism.

Garossino — a veteran columnist for Canada’s National Observer — wrote: “If your partner went through a challenging pregnancy and childbirth in the last two weeks, and you were over 16 years old, would you be blaring MRA bulls–t on Twitter right now?”

Garossino also replied to the Canadian activist and political consultant Gerald Butts, who tweeted: “Buddy has a 3 week old baby. Maybe step away from the broflakes.”

In response, Garossino wrote, “Not yet 2 weeks old.”

She also retweeted a message from the “Pivot” podcast, which suggested Musk should be arrested for attempting to re-open his Tesla factories in California. The state has recently shuttered all businesses due to the coronavirus outbreak, a move Musk called “fascist.”

“Red pill” references a scene in the 1999 film in which Keanu Reeves’ character Neo is offered a choice between learning the truth about the Matrix (“the red pill”) or continuing to exist in blissful ignorance (“the blue pill”).

“The Matrix” director Lilly Wachowski also condemned Musk for his “red pill” tweet.

After Musk’s tweet was endorsed by President Donald Trump’s daughter Ivanka, Wachowski tweeted at the pair: “F–k both of you.”

As The Post reported this weekend, Musk and Grimes — who had a Twitter spat over their son’s name after his birth — are both as “cuckoo” as each other.