Abort67 has previously told Telegraph Wonder Women that they record people in order to prove they're are not harassing anybody.
But a pregnant woman passer-by stopped to tell the protesters: "You don't know why people are doing what they're doing. But you want to be out here judging and then filming.
"You're standing out here making people feel guilty. I think this is wrong on so many levels."
She contrasted the protesters' actions with that of charity Kids Company, which have their premises close to the clinic and provide "practical, emotional and educational support to vulnerable inner-city children".
The woman was filmed by journalist Sunny Hundal, who was outside the clinic talking to anti-abortion activists.
Abort67 director Andrew Stephenson said: "If abortion is just the removal of a blob of tissue, then why would a woman feel uncomfortable about seeing it?
"The fact that seeing abortion actually makes the whole of society feel guilty is the best evidence that abortion is far worse than abortion lobby has led us to believe.
"It is perverse beyond belief when the viewers' response to that is, 'how dare you show it to me' rather than, 'how dare abortionists do it to an unborn child'."
He said that the idea of Hundal videoing them in the first place was ironic, as it "vilified them filming themselves outside a clinic".
Abort67 has previously spoken about how their actions "empower" women.
"All we're doing is holding up banners of what abortion looks like," Stephenson said.
"If that causes such strong emotions like feelings of anger and distresses, we don't deny that, but that's because abortion is distressing.
"We certainly engage [but] if people don't want to talk they just walk past, BPAS are infantilising women with this idea that they can't handle being spoken to. All of our volunteers are polite and agree to a code of conduct."
Donations for Kids Company, mentioned in the video by the woman, can be made here.
