Hackaday comments are terrible no matter the subject. I don't know why, but they always have been; useful content is seldom and the tone is that of a struggle session. When you're on Hackaday, nothing is about
fun. You are
hobbying wrong and
the world has to know about it RIGHT NOW. Granted, there's the occasional case where flagrant disregard for safety exists and wants addressing, but even that, I think, could be more usefully handled with less of a "you're worthless and you should feel terrible about yourself" vibe, not least because if you drive decent people away with your godawful attitude, no one's going to hear your warning.
I don't know from Petapixel, but if it's the hobby photographer equivalent of Hackaday, that's terrifying. I'm sure there are serious amateur photographers who are also perfectly nice people, but for some reason the ones I find myself dealing with are more on the "why bother trying to frame anything, it's a phone so it'll come out bad anyway" level. I'm sure that guy would be perfectly at home on Petapixel.