Disagreeing with someone's decisions is not a valid justification for misrepresenting their motives.
I agree with you, it's kinda shitty, but I get where he's coming from. It's incredibly frustrating to want to improve the security of the world, but when developers have too much ego and push back against claims of vulnerabilities in the face of proof, well...every hero either dies or lives long enough to become the villain.
I've experienced it first-hand at a previous job. I found a buffer overflow in some firmware, and engineering just said "Meh, at worst you'll just segfault the device, and the user can just reboot". The fix would have literally just been a two-line buffer length test that throws a 400 Bad Request (It was an embedded web server written in C, with the vuln being in an XML parsing library), but I had to go through the effort of taking that bug and learning ARM assembly and return-oriented programming in order to create a PoC before engineering decided to fix it.
I suppose I should be happy, though, as that learning experience was the cannon that shot me from just being a test engineer into getting into AppSec.