"Why do we as women need to be validated by showing our bodies in swimsuits after we have lost weight," one user commented.
Other trolls accused the MAFS star of using photoshop on her photos.
"These are gorgeous photos but sad they still photoshop a woman that is so body positive," another person commented.
"The thigh gap hole on the left is the worst photoshopping attempt. C'mon Liz. Why let them do this to you? Defeats everything you stand for," wrote another user.
The 27-year-old took to an Instagram story to respond to the photoshop claims.
“Someone said in my last post it was photoshopped! Um no, take a look, laughable. Yes there would (be) brightening techniques but no sweetheart,” she wrote.
Later on, the MAFS star posted another bikini picture from her shoot, adding this caption to the Instagram post.
"Talking about thigh gaps, I have a thigh gap, I’m not the most tone person on the planet I have really big hip bones and the top of my legs don’t touch, apologies for my bone structure offending you. If you are choosing to ‘zoom’ in look at my stretch marks and dimples and where my tan has worn off. Look at my rolls even in this picture. People saying you lost weight how is that body confidence. Honey, I was posing in bikinis way back...Teach body love. Maybe those comments come from insecure people. Who don’t love their bodies. Why are we conditioned to hate our bodies, and if you love yours, it’s like, how dare you?"
Married at First Sight's Martha Kalifatidis jumped to support her co-star, commenting "You look incredible. For every nasty comment, you get, be sure to send them a super skimpy bikini pic to show em what you’re really made of!"
Lizzie also reshared all the positive responses from fans to her Instagram story.