You're bringing it up, so I'm assuming you see some of these comments as being personal attacks.
One of the biggest problems of the Internet is the ability for people to create little walled off enclaves of like-minded folks who never criticize each other. This is not conducive to any kind of creative endeavor. You're not going to find any great artists who didn't have to deal with criticism.
It's really quite difficult to be creative and active on the internet for those reasons - while "happy little echo chambers" are hardly conducive to creative endeavour, the inverse is no more beneficial - it's downright toxic to creativity to be continually confronted with the kind of criticism endemic to the internet. Personally speaking, I've struggled with depression in the past, and it's hard enough facing down hostility from the worst parts of my own psyche without having to withstand it from the faceless hordes of internetland as well.
So yeah, it's a wonderfully well-intentioned notion, but the execution is lacking.
It's nice that lots of game designers post on rpg.net, but the biggest flaw of that site is an inability to call out people for having garbage opinions.
Im sorry if it hurts the designers' feelings to have their product dumped on,
No. There are better ways to express dissatisfaction than acerbic rants on the internet. About the only thing that kind of venting is good for is catharsis, because the signal-to-noise ratio across even the best parts of the internet is appalling - nobody with any sense takes "something they read on the internet" at face value.