If someone say "please don't email me about this anymore" after writing a hit piece on someone and there company without giving them an opportunity to respond they are being provocative, goading and a troll.
If the founder wants to respond they can write a respectful blog post and put it on the fucking homepage. They don't have a right to harangue the author via email.
And why is that, exactly? They do have this “right” and they exercise it.