Why should they be forced to care about an all new character when they already see so much of themselves in Spider-man. Sure, there could be all new bisexual Superheros, but people still love Spider-man and want to relate to him. They can be shy, they can be just like every other kid, just a little confused on why they are told they are different and should be treated differently. Yes, Gay people on shows are often annoying, in your face, and flamboyant, this is a stereotypical view and not at all like a lot of gay and bisexual people you meet. Saying Gay people should create their own culture and get out of the norm angers me. Modern Teenagers are often unsure about their sexuality, it brings a lot of confusion during growing up. I see Spider-man exploring his sexuality as a great thing, he doesn't have to be gay, but he would be exploring parts of the modern teen which many could identify with.
Sure, it's probably not going to happen, but having the option to think about the idea is good. Being overly aggressive to the idea is pointless.