You find everything disgusting that is out of your religious suburban comfort zone. You may have recently decided to become atheist, but you still have many years of strict religious conditioning to hate and fear what is different or not normal in your close-minded world.
I don't play the rating game myself. I think going around and giving random people a number is rather silly. You are probably disheartened that these boys seem to be treating other people only as loveual objects instead of people. You're dealing with boys in the early to middle stages of puberty though, they're going to be horny as all forget. That is unless they were raised in the same strict religious setting you were, in which you are encouraged to suppress any feelings of loveuality. If they were, perhaps they didn't take it to heart as much as you did from an early age.
In addition, they weemed perfectly fine with discussing fapping out loud with others; comparing favorite sites and the like. This is a serious social taboo to me. Again, am I alone on this?
Again, your strict Christian upbringing has implanted the idea that your body is shameful and something that should not be discussed. If you want to separate yourself from that world (I believe you do after reading that chat log you posted about religion) you have to become more open-minded to these types of things. You're not expected to participate in them in you do not so desire, but you may feel more satisfied with yourself if you can learn to accept that different people have different ideologies and cease your fits of anger over subjects like loveuality.
edit: tl;dr: Stop hating others so much and you'll be a more relaxed peaceful person.
Location: Southern California
A hotbed of religious conservatism, especially if you are near San Diego. You may experience a lot of conflict between your ideas and those of the general community. Also, hyper-Catholic Mexicans.