My friend, let's call him Sam, was always annoying and arrogant, but he was funny and we had similar interests so I dealt.
Here's the first thing: He had a crush on a mutual friend, Kate, who kind of liked him back. However, she decided that she didn't really want to date him. So he calls her a whore in front of all of his friends. One of these friends, Brian, told Kate about this and she was understandably pissed. So then Sam proceeds to act all pouty to Brian. He said things like, "he's the worst friend in the world." This pissed me the fuck off because he acted pouty because someone told the truth because he thought it was wrong to say that about your supposed best friend (Kate and Sam are obviously not bests friends anymore)
Well the fun doesn't stop there. One day we were in homeroom and he mentioned something about 'us Jews.' (He was Jewish, I'm not sure how this came up) I proceeded to say that I wasn't Jewish (I'm an atheist and I get a lot of flack from some of my family for it so it's a touchy subject for me and he knows this) and he says 'yes you are, because I am telling you you are.' He looked so fucking smug and I wanted to punch him. How dare he disrespect my beliefs like that!
Moving on, we are both in the Honors Math Class. During this time, he was getting better grades than I (although now I have a higher average). He straight up goes up to me and says, "I'm smarter than you." I then proceed to ask him why I am getting better grades than he in every other subject but math. He says, "Because you are a better student than me." I correct his grammar to "better student than I," because that's what I liked to do when people act pretentious and stormed off. I have self-esteem and body image issues (something he also knew), and often the fact that I get good grades is the only thing I have to reaffirm to myself that I have value. His saying this absolutely crushed me and I became super self-concious. On the flip side, it did motivate me to study more just to beat him so that was good. This was the point where I no longer considered him a friend, but he was still within my friend group.
This is when shit gets real. He missed a day in science class. Our science teacher makes us do lab reports based on the labs we do in class. For the lab report, you need a diagram of the lab setup, which he couldn't do because he wasn't there for the lab. At 11:00ish in the morning he asked me if I could send it to him. I told him that if I did the diagram section (which is the last part of the report and therefore the thing would do last) I would send it to him. at this time I didn't like him, but I didn't want to be an asshole so I decided what the hell. I then start the report and my dad and I go get lunch. By now, it's about 1:00. He then sends me a text that says, 'it's been 3 hours, hurry the fuck up.' I told him that I wasn't home and couldn't send it to him, but I was pissed that he got mad over something that was a favor since I had no obligation to help him. My dad tells me we are going to visit my mother in the hospital. I had known my mom was in the hospital for a 2 days, but I just thought it was for some swelling in her arm. While I was at the hospital, I was told that the swelling was due to my mom having Lymphoma. I was understandably very shaken by this and we spent about 4 hours at the hospital. As I am leaving, I check my phone and see tons of angry texts from Sam. He says things like, "ITS BEEN SIX FUCKING HOURS WHY HAVEN'T YOU SENT IT." My only response was, "I'm sorry I had to visit my mom in the fucking hospital.' He gave a half-assed apology. When I got home, the last thing I wanted to do was that fucking lab report. I was just sitting watching TV trying not to think about my mother when Sam texts me once again. "SURELY YOU'RE HOME BY NOW, FUCKING HELP ME. YOU PROMISED ME YOU WOULD. YOU ARE SUCH A TERRIBLE FRIEND." I told him that I never promised and didn't read anymore of his texts for the rest of the night. (My other friend intentionally send Sam a super blurry picture of it because Sam was being an asshole to him too). This just proved to me how much of a fucking entitled, inconsiderate person he was.
This one happened a few weeks later. He somehow managed to deduce I was mad at him /s. He, showing the full extend of his social ineptitude, asked me point blank, 'Why do you hate me?' in the middle of the fucking hallway. I gave a non-answer and ran off to go to my bus. While I was on my bus, he created one of those snapchat group chats and titled it 'People Who Hate Me (Sam),' no joke, that was the name verbatim. In it were Kate and I. I just sat there wondering what possibly could have possessed him to think that this was a good idea in any way.
He made messages in the groupchat such as, 'Why do you two hate me?' 'I thought you were my closest friends?' (We were until you started acting like an asshole), and then asked 'If I killed myself would you even care?' Kate, tired of his inability to comprehend why we were made and his being melodramatic promptly left the group.