I live in a flat with six people and I'm going to leave.
Why would you want to do that?
I dislike the people here, I can't stand to stay with them for another day
It is only natural to want to move out of a living situation you are not happy with. However, do your best to let the others know so you are not catching them off guard. Maybe giving them some sort of notice would at least allow them to find a replacement.
I'm not going to let them know, I don't care if they think I'm an asshole. I can't be bothered with them anyways.
As a flat mate you should be respectful and give them some warning, as this is putting them in financial hardship that is unfair regardless of your feelings towards them. This might also negatively impact you as others might not want to live with you in the future.