<human>: So, this happened about three years ago, like every TIFU.

But today I saw one of my friends get pranked with the good 'ol "Guys, I think it's time I came out and told you all that I'm gay." status while leaving their computer/phone unattended. Well, it reminded me of one of my first experiences when I came to the US during high school (My dad was military so I spent most of my life abroad). 

You see, I made a couple of acquaintances that I considered to be pretty decent friends, and being a dick to your friends was all the rage back then, so I decided to go ahead and do exactly what 90% of all friends did to each other and wrote "I'm gay" as a status. 

Now, in most of these cases what ends up happening is that a bunch of people think it's mildly amusing as a "Haha, that's what you get for leaving your shit out" moment, a couple of scoffs at the immaturity, and a very few people that are out of the loop (usually aunts and grandmothers) that are either concerned or supportive.

Well, I had underestimated the back-woodedness of living in the capital of South Carolina and apparently nobody heard of this being a thing, so this kid ended up getting a lot of shit from friends and family because if they're backwards enough to not get the joke, then they're backwards enough to immediately disown the poor fuck without questioning anything. Most of his friends (and some of his family) started being dicks to him because they were all homophobic dicks and didn't believe that somebody would prank somebody with something as sinful as gayness (because sin is not a joke).  

So the guy hated my guts because he couldn't fathom why anybody would do such a cruel thing as a joke and he pretty much tried to fight me every time we ran into each other. I eventually get detention or suspention or something, and the school had an assembly about cyber bullying.

Can you summarize the given text in a few sentences?
<bot>: Wrote "I'm gay" on a friend's status, he gets disowned, tries to fight me, school has a cyber-bullying assembly.