Hate everywhere in "1984"

Hate is the main topic of the first two chapters of the book "1984" by George Orwell. Therefore it is pretty significant for Winston. As he is sitting in the one corner starting to write a diary, he thinks about a lot of things and starts writing. After a while he is writing DOWN WITH BIG BROTHER over and over again what shows his hate on INGSOC and BIG BROTHER. He can't stop writing it and it is like an automatic action. Shortly after it says "His pen had slid volupuloously over the smooth paper, printing in large neat capitals-" showing his confidence and real belief in DOWN WITH BIG BROTHER. It also displays that he is forced to act like he advocates BIG BROTHER although he actually doesn't.
There is another thing Winston hates-the girl with the black hair. Is says that "He hated her because she was young and pretty and sexless..", showing that Winston would like to go to bed with her but knows he will never be able to and that is the reason of his hatred. She also is a little bit of the opposite of Winston as she is young and beautiful compared to him as old and not so pretty, showing him that there is no chance for him.
My personal opinion of the idea of hate is that I am surprised why they thought while writing the book in 1949 that the future would be filled with so much hate. I think that Winston's hatred of BIG BROTHER is justified because he acknowledged the bad purpose of the the whole idea of BIG BROTHER.