First of all, what utter bollocks.
Secondly, what do you want me (and others) to do about it? Because telling me how unacceptable and what a disgrace everything is means absolutely fuck all to me. If you are serious about how this mentality of your fandom is about breading a mentality that will push the club forward by screaming and raging (LOL) then write to Poch. He is that man you have a problem with, he is the man that is responsible for not providing the team with the winning mentality you crave. Every single thing your are crying about is his responsibility.
Thirdly, I don't think you've been to Old Trafford in the last 5yrs or so have you? If you had you will know it's a fucking morgue, no-one is screaming, no-one is demanding anything. I think you've spent too much time online watching Woolwich Fan TV thinking that is how a fan should be. When most of us laugh our heads of at them being absolute cunts. If DT is the fan you aspire to be, then congratulations you have reached your nirvana.
Nothing wrong with being frustrated or angry at a result, but a) Make sure it's in context with the performance b) you don't half spout a lot of shit, the sort of shit that gets turned into memes from rival fans, you know the fans I'm talking about, we all laugh at them when the fans with "winning mentality" show their faces on twitter or youtube, take a look in the mirror, there is no difference between them and you.