I will admit, if anyone under seventeen tells me they're bisexual I may not believe them right away. Simply because it's become a trend. You know? But I don't think it's wrong at all.
I'm straight and I don't think it's wrong. I think it's just that people expect you to be "one or the other" so to speak, you can't be in the "middle" cause it goes against these people's opinions. :)