Hii!! I'm new to Reddit, and I have no one else to vent to. So please give me advice!! So me, (12, F) and J, (13, M) were friends. I met J through S (12, F), who is still my bff to this day. S is bisexual and has a boyfriend, K (13, trans F). K is a therian, if you don't know what that is, look it up. Now, J HATED therians and said they were corny. He would always talk behind K's back to me. I suggested to talk to K, and end their friendship. But J insisted that it will be fine. J was very problematic, and somehow was the victim in every situation. Spamming, my fault. Arguments, my fault. K expressing himself, my fault somehow? And one day, J decided to show his true colors. One day, J said something stupid he did. Joint around, K called him a dumbass. J is sensitive, and quickly started an argument with K. J sent a sticker of a foolish drawn person with a thought bubble, a therian in it. K got offended, as he should've. S jumped in, and I did quickly after. Then later, we all blocked him and licked him out of the gc, or so I thought. S had not blocked him, because she felt bad. The topic was brought up, and an argument started after. J had called S a "Suicidal bitch." Crazy, right? He had never spoken to me like that, but I got offended, because he said that to my best friend. S had immediately showed the gc what he said, and I had unblocked him. I said some not-so-nice words to him, and now I feel guilty. I feel guilty because he had told S what I said. He said he was going to... self exit. I feel like I've caused those thoughts in his head... and now I feel like Im the problem. So, am I the asshole? (The bright green texts are S, the dark green texts are me) 

Am I the asshole for speaking rudely to an extremely toxic person?