It’s not that Bi people aren’t a thing to them, it’s just that being in a relationship with someone who is believed to be straight or Bi is a wild card for gay people, meaning they feel more anxious being in a relationship with them.
This topic is well portrayed/explained in a manhua/BL called here u are, you can read it here(▰˘◡˘▰)
yeah and the reason why gay ppl are anxious to be in a relationship with bisexuals boils down to biphobia :) the stereotypes that they're cheaters, sluts, or will abandon the same sex for the opposite are reasons why biphobia is so prominent in the lgbt community. its almost as if cheating/abandoning someone does not have anything to do with sexuality but attitude.
i love here u are!! its one of my favorite bl comics. they give me warm feelings :D
i swearrrr these bl characters have never heard of the word bisexuality in their entire lives. what do you think the B in LGBT stands for hm?? HM??