What is happening , I hate what’s happening

Dude , I have a 15 year old friend who keeps making very uncomfortable jokes about me and my best friend who’s 16 BY THE WAY . He says shit like “ oh you’re probably having sex with [ my best friends ’ name ] ” like I’m sorry but WHAATT ? ! ? And he finds it so fucking funny when it isn’t , because now they were best friends at one point of their lives and then my 16 yo best friend drifted away from him due to the 15 yo making the 16 yo super fucking uncomfortable by the way . And the 15 yo calls the 16 yo a fucking opp because he doesn’t talk to him willingly when HE TALKS TO ME willingly . By the way , the 15 yo has a fucking girlfriend and the 16 yo doesn’t have one anymore and so it makes it worse . The 15 yo says shit like “ is he male ? Then he’s jorked it before “ not all men have beat their shit ya know . “ oh he can go suck off [ somebody the 16 yo hates ] “ and then laughs it off like what . He finds this shit to fucking funny , I vented to him about my old friends when I was ten and elven years old and he said “ O M G ! Almost 9 / 11 ! “ excuse me ? Again , he makes sex jokes about my best friend and I , “ You probably want his babies in you ;3 “ no I fucking do not , I’m 13 . The 16 yo is about to be fucking 17 this year man , and then the 15 yo is gonna be a 16 yo this year too . And this shit is actually so fucking disgusting man I actually hate this shit man , I told the 15 yo about it but all I got was an “ okay “ not an “ I’m sorry “ . I don’t even know man