If a dude wrote "Te voy a matar..." on my fb wall, should I write this back? Idk what to say!?

" Wth Gabriel?? Tu eres loco ya punk y no more Black Swan with you! " (cause he wanted to watch Black Swan with me when I come back home to visit. Do you think he was just joking as a friend or was that way too inappropriate even as a friend? I'm a little annoyed that he wrote that