I'm angry at my dad because he told me he is having another son
Why are you so angry about getting a brother?
I hate kids and I always begged him to give up on having children.
You should not be angry at your parents over things like this. It is normal to have another child.
Everyone is calling me a fucking asshole.
Have you talked to your father about how him having another child makes you feel? Talking to him about this might make you understand why he is having another child, and may make you feel better about the situation.