I hate all of them

I hate XX and XXX very much. And I hate almost all of my senior middle school classmates. They are so rude and indifferent. They always borrowed  me many things, but when I need their help, they didn't give me a hand, meanwhile they turned  their heads sideways and thought it was none of their business .my elder sister always complained about many of her acquaintance to me when she was young , I can't understand why she hated them so much. It took me ages to know she was right. There are too much discontent among people.