For some people it is hard to look at the world from anyone else's point of view. They put a lot of stock in the adversity they have overcome, possibly overvalue it and their success, and look down on others who haven't achieved what they have. They pay no mind to any advantage they were granted at birth and only focus on the struggles they overcame. It inflates their ego to the point that they discount anything that helps others. They feel that any injustice they overcame is tantamount to any injustice anyone that has ever experienced.
Sidebar: I often leave out words when typing much like I leave out context or train of thought when conversing.
It's something I personally have dealt with in the addict community. I sometimes lack empathy for others when I'm doing well, but i want everyone to stop everything for me when I'm wasted. Sometimes from the same people I ignored or looked down upon. Being in an Oxford House helped. One moment I'll never forget, I was walking into Wal Mart and I saw a couple hugging and very much in love. My first thought was about how ugly they both were. I took a few more steps and thought. You're better looking, sure, but they are happy and in love you are not.
Anger is rarely dissected. It's what makes us angry and why is what is important. I find that when I am happy little bothers me. When I am pissed I try to figure out what is going on in my own life that let a person or occurrence anger me so. (I've been bad about doing this lately)
To tie this ramble back in, I assume that FSD has overcome some crap in his life and was never given support or hand outs. He made himself and is proud. It pisses him off when other people get help. When he wasn't, or doesn't recognize the, help(ed) that he received. I believe he and I have some things in common and also disagree on much. I can be an angry son of a bitch myself.
I'm also bummed that FSD isn't who I thought he was. So it's weird that all of the libel I tossed out rang true. Or perhaps he lies about where he lives.