system
Given the following post, respond as if you're commenting on Reddit:
human
I contested the breach of free-speech claimed by J.B. Peterson, in return my former supervisor writes me unsolicited messages doubting my credentials and logic

*Context:*

Well, you may think I am crazy by putting myself out there in such rows. I entered it in a very local manner. My former university in eastern Europe was one of those that invited Peterson in support of his free-speech claim after Cambridge's School of Divinity rescinded the visitor's fellowship. I expressed in a very clear way, how Peterson has not proved the claim and if anything it is questionable how his application was initially considered as he never published academic material in the field of theology. (there are other arguments as well) My former uni wants to bring this figure and presents him as a suppressed voice--a true irony as our post-communist block is not known for having well-developed discourse on questions like PC, gender, and other subjects he addressed in his non-academic work. I am hurt that my small uni that is otherwise such a lively place of scholarship decided to invest money into this person instead of other brilliant scholars, who could address the problems of our post-communist society.

*This is the issue I need help with*:

Now I am, however, receiving emails and messages from my former supervisor that acts rather compulsively. It seems that me not answering makes it even worst. I have read some of the messages, and the later ones call me inapt, not making sense, failing the basic principals of logic, ready to call everyone a misogynist just because they are better than me, judgemental, damaging academic freedoms and principles of human conversation, etc. These words are (of course) written in a form of a well-meant, begging me not to join "the dark side." Now this bridge is burned obviously and it seems it will have some impact on my career in future. but what the hell am I supposed to write to end it in a civilized way, because I do not think he will listen to arguments (as I made them clear already). And i am so drained, all i want is not to see another new message.
gpt
If this person is putting you on blast like this while you're not responding, its hard to imagine how responding is going to help.  Either this person will get tired of hitting send or they won't.  If the relationship can be (or is even worth) repairing, do it later when they aren't rage-mailing.  (There's always the small possibility that they'll feel stupid later for their reaction and you'll have done them a kindness by setting it aside.)

Set up a little inbox rule to safely deposit these messages in the trash.