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

Other days

artists

Artists Day
eat what you want

Eat What You Want Day
boba

Boba Day
donate your hair

Donate Your Hair Day
bubble bath

Bubble Bath Day
cursing

Cursing Day
china

China Day
pumpkin

Pumpkin Day
mean girls

Mean Girls Day
coffee

Coffee Day