Bjo Trimble referred to slash writers as a "bunch of twisted sickos". I never thought of that before. Hehehe, I know right? I mean no disrespect to people who either write or read fan fiction. The letter was then posted openly to the Internet.
For some other examples of early fan reaction, see:
But I also want to tell you not to suffer any remorse for no longer being able to contribute. But I was dismayed by the stories and no longer purchase these fanzines or others of their kind. Many people wrote it in the form of drawerficstories that were written with the intention they would not be shared with others, and in the form of circuit stories, fanfic that was meant to circulated among a small group of friends.
Simultaneously, the gay community was in the process of coming out of the closet, so while many Trek stories were fem-lib based, others were gay-lib based.