I wasn't much older than you were at the time. People deep down know what is right and wrong, even if they are conditioned to believe otherwise. (that's why they must be conditioned, it's not a natural state to be in)

I always thought homosexuality was freaking weird, even though I was definitely conditioned to accept it or be considered a bigot. I had a friend who was gay, and I remember thinking at the time, "Well as long as he isn't asking ME to go that route, it's not my problem".

I still feel the same way, though my understanding of just how immoral it is has changed. It really is his problem, but if I could go back I would have made it clear that it was wrong and tried to correct him. My understanding of casual sex has definitely changed (you are right about the Friends normalizing that stuff), but even then I knew there was something off about it, I just had not heard anyone voicing opposition. Most of what I heard back then was negative stuff about being a virgin or whatever. I totally get it now. It's insecure/immoral people trying to normalize their behavior, same as the gays. They attack what is good rather than fix their own problems, because that's easier than admitting you are wrong.

I wish I had the awareness I have now so I could articulate it better then. Everyone knows it doesn't feel right though. Notice that no one portrays homosexuality as righteous, just as normal or tolerable. Same with casual sex.