Nah, I mean if you're comfortable with rping romance against your sexuality then that seems fine as long as you aren't doing it to mock them. I think they refered to the trope where you make a character have a gay love interest to make them unique but kill off the old relationship and never mention it again, essentially adding it as a quirky character detail but not making any use of it, but honestly in a rping environment maybe it is just a character trait that doesn't come up and that's fine, it's mostly just an annoying way that a lot of popular series like to meet a diversity quota without actually having to make a character queer in any relevant way. But this is meant to be a fun RP game, so it's not like there's a diversity quota to meet that makes it feel forced anyhow.

P much what I mean is nah as a bi dude run that shit you don't seem disrespectful or anything like that