My friends with benefits is mad I told him happy birthday an hour after his birthday started [23M] [25F]. Why was he upset?

WinCx3d

My friends with benefits birthday is today. His birthday started at midnight. At around 1:25 am he was calling and blowing my phone up. I answered and he said “well thanks for telling me happy birthday”

And i said “the day just started i have all day to tell you happy birthday” and he hung up the phone

TL:DR; why was he upset and worried about a simple happy birthday wish
My friends with benefits is mad I told him happy birthday an hour after his birthday started [23M] [25F]. Why was he upset?
25 Opinion