I hurt my friend's feelings easily

Good day, fellows of the forum. I have always had difficulty keeping myself in control. Especially when I talk to my HPD friend. He's just such a prick( I hate to swear, I just really need to let it out because he really is so outrageous at time.) One of the more recent conflicts with him is posted somewhere in the Histrionic forum. post1098490.html#p1098490 Apparently, I also nearly broke the rules until he pointed out that my post was too enraged and unethical. And hell, he's a bloody well example to be using! To walk around the class announcing his "INSANITY" to the whole class; that's pretty unethical if you ask me! And eventually, I end up yelling at him online because I'm terrified of saying it out loud. As much as I would really put him to shame by mentioning him, I'm afraid he'd beat me to it. You see, online, I don't really stammer and I don't really have to be afraid of freely expressing myself. I know that I won't be ridiculed online, and I know that I can finally assert MY dominance over my friend without him slapping the table to put emphasis. Please tell me what I can do with my anger. Or if he really is being outrageous, should I just ditch him?