Our society fears what opposes them, or what is different.
To some, it’s like a threat to have something unfamiliar. In this case, bisexuals. For as long as humans have been on the earth, there’s always been some kind of prejudice, whether it be because of race, culture, religion, or something else. Now there is prejudice against bisexuals.
A lot of people probably don’t hate LGBT people, they push them away. And, well, this is self-contradictory, but when people push others away, that usually gives way for hate.
LGBT people haven’t done anything wrong in my point of view. But for the people who push them away for the sole reason that they are different? To them, it’s probably just because they are there. Those people expect everyone to be the same. Boys to like girls, girls to like boys. And when something upsets the balance of their world, they react by pushing it away and showing hate.
So much of our world is familiar to us. LGBT people are part of it. But for a lot of people, they don’t accept and embrace that. They hate it instead. To be honest, I can’t say for sure what causes that hate. Maybe you just have to be one of those people to truly understand that. But my guess is that people fear and hate the unknown. The unfamiliar. In this case, that unknown variable is bisexuals.