I read Gore Vidal's "The City and the Pillar" on the floor of the upstairs stacks at my high school library, and was shaken and disturbed for weeks. It's simultaneously pro-gay rights and weirdly anti-gay people.
But these are flawed books, by flawed writers, who are flawed men and flawed gay men. Larry became an Old Testament prophet once AIDS arrived. Gore became a New Testament prophet against the American Empire.
And that's who they were in the times in which they lived.
I would say go ahead and read "Faggots." I doubt it will affect you the way it affected the young FindingNamo. Then read "The City and the Pillar." They're both juicy reads.
Then, if you haven't slit your wrists, read something fun. Read "Auntie Mame."