Goes the other way. If he was a decent friend and not a complete weirdo he wouldn't throw a hissy fit over someone using his first given name.
Hmm. I think we have different definitions of "hissy fit" then.
From what I see, OP is the one having a hissy fit just because some dude wont be his playmate and play games with him any more.
The other dude has made a simple request "Don't you ever use my name again or I'll delete you". Therefore this other dude clearly 100% rational and has no emotional connection to the friendship, nor the OP and appears to have nothing to lose.
OP on the other hand is clearly severely emotionally distressed at the fact that some dude has stopped playing games with him and is emotional about losing a playmate, he comes across as if he has everything to lose.