For others that might be busy at work thinking this is a bigoted piece, it's not. The narrator was walking with his friend (both male), when an unknown assailant threw a brick at his friend, landing him in the hospital, because he thought that the two friends were gay.
The hate in the title is a line from the story, in which the narrator describes his hatred for everything around him (concerning the situation) in a blindingly detailed and empathetic level.
Edit: As rightly mentioned as a reply to this comment, the piece is fictional, but poignant nonetheless. I've edited my use of "author" to "narrator" to try to clarify.