If you don’t know How To Turn Off Comments On Fb Post that are negative then you must follow the steps that are given below:-

To comment on your post, open it and tap the three dots (...) at the upper-right corner.

Select Who Can Comment on Your Post from the menu.

Choose the audience you want to allow to comment on this post.

Tap Done to confirm your choice.

Refresh your post to apply the changes.

Read More:-https://allinsider.net/how-to-turn-off-comments-on-facebook-post/