Next question, how does a Buyer, who left negative feedback, follow up on Seller comment like that.  I looked but cannot find a way to do this.

there is prob an easier way, but this is the ONLY way i know how.
Click on your own feedback score > then click on feedback forum> look left>> it says *respond to feedback left*  or something like that.
click on that link and up comes all your feedback and to the left is the option to *respond*

🙂