Barry hit back at the woman, explaining how she believed the Anti-Vax movement is "most certainly feral".
"They're like a street gang that operates on the internet trolling Facebook to spread their propaganda," Barry wrote.
"I've seen their vitriol, I've been on the end of it and so did the woman who featured in our story. So I won't apologise for something that is true.
"The World Health Organisation lists anti-vaxxers as one of the top ten threats to global health along with Ebola.
"That is an insult every anti-vaxxer should think about."
But Barry's heavy response went viral, with anti-vaxxers slamming Barry for her opinion.
The comment prompted the host to share another post, asking others to lay a complaint through the Broadcasting Standards Authority.
I've had so much feedback today on my vaccine post.
Thank you.
In particular, thank you to the gentleman who...
Posted by Hilary Barry on Thursday, 7 November 2019
"In particular, thank you to the gentleman who suggested I "top" myself for being pro-vaccine. It's really made me even more energised to protect our children and those who are immunocompromised.
"Please, please anti-vax movement members lay a complaint against me via the following link because I really would LOVE to take you on through an official channel rather than reading your vile, violent and feral comments online."