How to proceed after reject & resubmit
Let me suggest two things. First is that you ignore the rudeness and take what is in the reviews you got to improve the paper as best you can. In other words, standard practice.
But, when you resubmit, let the editor know that you have conflicts, beyond the paper, with individual A (by name) and that you don't believe they can give you a fair reading. Ask that the editor not assign them as your reviewer. I suspect that this is an unusual request (in some fields), but that it would be honored. The editor needs honest appraisals, unclouded by personal issues.