Bf mad at me! did i do something wrong? :/ help!?

so on facebook,this guy sunshine commented on my wall saying "ni-ga<33(:" (inside joke) then i commented back sayung the same thing. then he commented back saying "i took my cast off!" then i said "without letting me sign it ):" then he said "well,you could always sign somewhere else.lol" i said "lmao. what is that in your profile pic?" trying to just disreguard what he was saying. my boyfriend texts me saying "that kid is pissin me off" i said "who?" he said "that kid that said "you could sign somewhere else" then i said "ohhh sunshine" then he's all "yeah" then i said "idk what to say" then my bf asked me "what did you say back?" then i told him i said "lmao. whats that in your profile pic?" then my bf said "ok goodnight" then i was like "ok :/" he said "i wanna talk about this later but im too tired and not in the mood" i feel like he's mad at me!!! what do ido? this was last night,do i wait for my bf to text me? or do i text him apologizing,what do i say?? :(