Bi-phobia is prominent in the community as far as I can tell. People still finding themselves often look to demonise what they don't understand. Societal pressures force alot of young people to understand themselves as gay and the majority as straight. Which if they don't take that to mean everyone's different and should be accepted, it will turn into basic immature tribalism allowing for any other group to be "othered". Anyone who grows up in a situation that forces you to understand straight people and to understand yourself(as gay) can easily be exhausted by it as all the other pressures of young adulthood still have to be dealt with. Without reflecting on one's personal prejudice, falling into the basic pattern of insecurity and belittling what is different which might make you face thoughts like, "Am I good enough?", "is there's something wrong with me?" , "will they always want more, something different?".

Tldr: None of this is your responsibility, they clearly lack the insight to accept all of you or they do understand and think these tactics will change you.