Do as I say, not as I do.

A Massachusetts teenager who publicly shamed her mother for attending the Capitol riot said her mom was “brainwashed” by the MAGA movement and lied to her — telling her daughter she was going to visit an out-of-town doctor.

Helena Duke, 18, went viral Thursday after she tweeted a video of a woman being punched in the face during the violent pro-President Trump protests in Washington, DC, Wednesday, with the caption: “hi mom remember the time you told me I shouldn’t go to BLM protests bc they could get violent…this you?”

In the clip, a white woman tries to grab a phone off a black woman — who appears to be wearing a police uniform — before being struck right between the eyes.

Duke followed up the tweet with another post comparing a picture of the bloody-faced woman in the video with a picture of her mom, saying “for those that don’t believe it’s my mother…”

The teen, whose initial tweet has been retweeted more than 66,000 times, told The Post that she only learned her mom was participating in the violent uprising after seeing footage online.

Therese Duke
Twitter

She said her mother — who has been identified by Newsweek as Therese Duke — had told her she would be out of town for three days to take her aunt to get a medical procedure done.

“She didn’t give me any more information about it, she was very vague … When I found out about the Capitol being stormed, I looked at her location sharing and it had been off for two days, so I assumed in that moment, I was like, ‘Oh my gosh, she might actually be there,’” Duke told The Post.

“And then the next day, my cousin shared a video of her getting punched in the face … by police after harassing them.”

protest-punch-44
Therese Duke after being punched at the US Capitol breach.

Duke said she believes her mom — a former Democrat who abruptly changed her political views about three years ago — has been “brainwashed” by the MAGA movement.

“I’m not surprised that these actions occurred or that my mom was involved with it because I think at this point, all she had in her head was that whatever the president tells her is right and is what she will go along with. So I think she had in her mind this was the right thing to do,” she said.

Duke admitted she initially had mixed feelings about outing her mother on social media, knowing that it may lead to her arrest, but that she ultimately decided to because her mom had previously kicked her out of their home for attending a Black Lives Matter protest.

“At first I was kind of uneasy about it, but I think it was definitely so hypocritical of her to end up kicking me out of the house for going to peaceful protests because she assumed they’d be violent, and then end up going to this, which was obviously a very violent attack on the Capitol — and end up harassing a cop,” she said.

However, the teen told The Post she does not believe her mother was among those who actually breached the Capitol.