While I've been able to avoid most of the shit in recent years because I got out before things went absolutely insane, I was certainly well on my way to going completely off the deep end.
In high school I was really conservative and a complete conspiracy theorist, I believed 9/11 was an inside job, that JFK wasn't killed by Oswald, the new world order by the free masons, and all the other crazy things I can't remember anymore. It primed me well enough for when I first saw Zeitgeist. I took everything at face value in it and basically lost my religion after watching and realizing similarities between Christianity and the other religions outlined. I found people like the Amazing Atheist, thunderfoot, and a number of angry dudes "taking down" Christians on youtube and was content for a while.
I was a complete prick about my atheism, I'd constantly bitch at my mother for her beliefs and would constantly talk down to her because to me at the time, she was the dumbest person imaginable, after all, I was an atheist and she was a Christian, and everything I saw on youtube further cemented the idea that Christian = stupid.
My best friends also were pretty much the same as me, just not as conspiracy theory minded. We would compete with each other about who could be the most offensive, but we were doing it "ironically." Joking about how the crappy driver in the parking lot was crappy because she was a woman, calling people epithets, if it was offensive, we were doing it in the name of "irony."
After I turned 18, the promise I made to myself as a child came back, that once I turned 18, I could finally be myself. I came out as a lesbian to a large amount of opposition. I left for college leaving a family that was in denial to a new state. While I was at school, I met quite a few really nice people in the school's GSA and that had started to soften me to a lot of things.
Eventually I started dropping youtube atheists one after another after the "Amazing" Atheist had a rant about how the recent string of gay people committing suicide. He called them all "pussies" and I stopped watching his sorry ass ever since.
Around the same time I found the Atheist Experience and it worked as a nice transitional piece between actual reasonable debate and the "creationist owned" type things. Found AronRa around this time as well and thought he was a pretty awesome person.
Eventually I came back home to the situation that had been left for almost 2 years, my mother was still super against it, the rest of my extended family basically disowned me save for my one aunt's family, and my friends decided to just out of nowhere one day ditch me.
I then started going to a different school and started living by myself in an unfamiliar city and had a lot of time to think about everything. As I reached lower and lower depths to my depression, I found myself becoming more empathetic to others. Particularly after I had a few moments where strangers would go out of there way to ask me how I was out of nowhere.
Since then I've tried to keep myself open to change and constantly in a state of improvement. I'd say reasonable atheists are the biggest reason I'm not still a jackass about my atheism. The friends I lost helped me realize that the people I was hanging out with kept me constantly trying to be offensive "ironically." And the family that still refuses to acknowledge me, well...fuck them, they're crappy people and I can just move on from them.