I think I understand what you mean about 'reinforcing negative mindstates'. I have found that to be the case on occasion...

But they are by far the minority of posts.
I have also learned to moniter myself.
I try to avoid posts posted by distressed posters when i am vulnerable myself.
There is a lot of kindness and supportiveness and silliness here too.
After a while you get the hang of where to look when you are in different moods.

But I guess forums are not for everyone.
And different forums are better suited to different people
(there are other forums out there too)
Anyways... I wish you well...