I am my department's top performer, guaranteed. I consistently work circles around my coworkers, provide support, and do everything else pretty much. They have rewarded others for their performance through a bi-monthly program, but some of these who were "rewarded" for their performance were also fired a few weeks later because of it.

Some coworkers of mine got a hold of my blog and tried to get me fired for it. My managers have taken me to HR where I was told that my work was solid, but my lifestyle was not. I was ordered to "keep it down", although I really didn't amp it up to begin with. Our VP of HR talked to me personally. She gave me a list of demands and I have followed every single one of them.

On the floor, I have been "gay bashed", coworkers have thrown paperwork at me, slammed doors in my face, and so on. I have complained to my managers, but this behavior continues which leads me to believe that no one has been talked to. I have been called "weak" and told "I don't know nothing" by these coworkers.

It's not everyone, it's a few people.

Is this discrimination? If so, what are my next steps as far as documentation? Am I out of line? I need a non-biased third party opinion here.

Yes it is but in many places it is not illegal to discrimiate for life style,

I could go in tomorrow and fire every person who dyes their hair, or every person with blue eyes

I can't fire someone for being black or being catholic or such.

Your next step, see if your city or state has any protection but I know in my state of Georgia, one can be fired for life style choices