Its not what you said. Its how it was said.
What you said could be grossly summarized as:
I'll read just about anything fiction unless there's a character who's under the rainbow or a gay focus.
(That's a micro aggression, its offensive, and this site is very lgbt friendly)
Instead maybe try:
I like to read action, mystery, sci-fi, and fantasy
I do not prefer romance, bl gl or lgbt, or slice of life
(No need to explain, no need to call lgbt people rainbows. You'll use the correct terms-- because the acronym you used was incorrect. And instead of it sounding like you're denouncing an entire marginalized group of people, you are maturely indicating that you don't like love stuff regardless of who's doing the loving.)
What you said made me feel like you wouldn't be interested in my story because I have lgbt characters. If you consider revising it to more open and less offensive language, people will leave more of their work and you may be surprised what you find.