Most Helpful Guy
Because they are narrow minded and possibly homophobic. From personal experience, I think it stems from what people think guys are supposed to be and being bi kind of goes against the mainstream Idea of what a man is. I've gotten shit from some on a pro American page on facebook where there are some guys on there that belive anyone who has certain cloths must be a liberal, an SJW and is at the very least bi so he is automatically seen as inferior.
Funny thing is I'm the outcast in their group and even though me being bi and having questionable ( to them) choice in jeans does get me shit, Even though I hold almost all views of theirs and that I love guns and other stuff that makes a REAL man.1