Do I have a legitimate workplace discrimination case?

I work, worked for the State of Pennsylvania. My job consisted of working with court appointed juvenile delinquents. I was just fired after being suspended for 3 months pending an investigation. In September 2010 two residents retaliated against me for giving them discipline for not following directives. Immediately after sanctions were handed out, those two residents went to a supervisor and began to make accusations about me. Many of those accusation were either cleared by an external agency or because I was able to prove those residents were lying.

Yet, my employer continued to allow testimony of these residents in other accusations. Some of the reasons I was terminated from my place of employment are as follows: I had a conversation with a co-worker outside of work and off duty, yet my co-worker submitted the conversation we had and that's reason #1 that I am being terminated. Can a conversation outside of work be brought into an investigation?

I have numerous examples of how fellow co-workers mostly all men (which I'd like to file a case on gender discrimination) that have committed the same infractions in which I've been terminated for.

Also, on my termination letter it was written under the headline of "Inappropriate Conduct" Keep in mind that me discussing my sexual behavior is a fabrication of the truth made up by a resident...

However, under the headline this sentence is one of the reasons I'm being fired. "You shared details about your sexual preferences and behaviors". Because they stated that discussing my sexual preferences, which I consider to be synonymous to orientation is workplace discrimination? Which according to a new management directive back in April state no worker can be discriminated against based on their sexual orientation.

DO I HAVE A CASE???

Sincerely,
Brandy S.