The issue with this forum is that a lot of people don't know the difference between general criticism and outright complaining.
Someone who provides criticism in an adult manner, with explanations of why they are criticizing that part of the game, will have a thread full of people who also provide criticism back, and everyone has a nice discussion over that part of the game, and where it can be improved.
Other people who resort to using terms like "care bear" (seems quite prevalent on the forums) and other derogatory terms, insults FDEV and just generally is a complete moan about how they are leaving the game due to their own fault or they don't like it, will most likely receive the same reaction back at them.
For example: Constructive Criticism looks like:
"I'm not too sure on whether or not the reputation system punishes more than rewards. I think it would be nice to see some sort of progress meter, for feedback to the player on their actions and so they know if they are doing the right thing or not. What do you guys think?"
Other types of comments that may cause people to be hostile back is something like:
"This game sucks. I handed in a mission and got NO REPUTATION. LIKE WHAT! How could FDEV be so BLIND! I won't be recommending this game to friends AT ALL! I quit! The game is full of care bears"
See the difference between the two posts? Unfortunately we see more of the latter here.