As a straight girl that enjoys BL and writes BL, the only 2 cents I have is that: Yes, I used to write cringy BL stories with cringy gay characters. Also yes, 8 years later, I still write BL but I identify them as more of a normal romance story, just two people falling in love with each other, gay or straight. (My characters are mostly pansexual, I don't force them in one or another) I write these story for the sake of telling a story, to satisfy my storytelling nerd. I would advise people not taking them too personally because in the end, they are not real. (Sure I might not be les, sure I'm aromantic and never actually experience the feeling of "romantic love" in my life. But that doesn't mean I can't write it, yea?)
LMFAO to me these terms aren't /that/ bad. Most of the time the q-slurs are thrown around as an endearing term, much like how Australians throwing "cunt" around in every sentence they speak or how you call your best friend "why u gotta be a bitch" I'm 99.99% sure they don't harbor any malice intention and shouldn't be taken seriously. It's the internet, you can't be so concern with your little feeling. On a side note about "sinning". Again, please do not take it seriously. Sin is a way for people to make fun of THEMSELVES and be hilarious about it for drawing something that if they show their parents, would receive a spanking. Not gonna lie I also use it too, but mostly on the sort of kinky arts that I secretly exchange with my friends.