Oops, it doesn't look like 'self hatred day' is a national day..

Other days

stud

Stud Day
comfy

Comfy Day
ormille

Ormille Day
camera

Camera Day
gum

Gum Day
martini

Martini Day
self care

Self Care Day
carpenters

Carpenters Day
self appreciation

Self Appreciation Day
cat girl

Cat Girl Day