As experience told me, not everything that has been proclaimed openly is open for debate. Sometimes, people just want to vent. Also, not every opinion is treated equally. We tend to value the opinions of others more when they are in line with our own trains of thoughts.
That being said, you are right when it comes to the many times you said that I as the reader probably knew a couple of the things that you posted. And I certainly agreed on a couple of them.
Some of the most unpopular ones, actually. Which leads back to my quote. Me replying to some other peoples problems by giving them my opinions on these topics that ended up not being what the person wanted hear. Led to some people not wanting to talk to me anymore.
They usually come back after days, weeks or months just so that they can tell me that I have been right all along, but of course, I knew that and by then, I usually don't care anymore.
Because being right is nice, but it is useless if you can't convince others. And I think that this is part of the reason as for why I read so much frustration in this post of yours.