While some showed their support for Unathi, others felt she shouldn't have posted the user's handle.
One Instagrammer told her to stop responding to the negativity, ignore it and move on.
Unathi responded by saying she will always stand up for herself, because it is also a lesson for her children.
“I am a mother of two beautiful children who live in a world filled with hurt bullies. I will never stop teaching them to stand up for themselves. This is why I do it. I have no interest in anything above them.
“Forgive me for not being the celebrity that you think I should be. I am the mother I want to be,” commented Unathi.
The star has often had to defend herself. A few months ago, Unathi hit back at maskless fans who get offended when she refuses photo opps. She said that with the realities of the coronavirus, it isn't a risk she is willing to take.
“I am noticing an increased tension building with people I have never met who want to engage with me and get offended if I decline when they are not wearing masks in public places. This is the new norm and it is going to be like this for a while.
“Daily, because I come from the Eastern Cape, which is terribly affected, we are receiving news of people dying. As I speak, I must return there tomorrow to bury my gran. My friends are losing their parents, siblings and colleagues, and this is hitting all of us hard.”