Then I'll tell you.
Kentucky, like every other state in the US except Montana and even including Montana in some circumstances, is an at-will employment state. That means that you can quit at any time and for any reason, and they can fire you at any time and for any reason that is not specifically prohibited by law.
There is no law in Kentucky or any other state that prohibits the employer from firing you because you're acting like a jackass, misusing company time, and/or letting your personal problems with a co-worker interfere with work.
What's more, there is no law in Kentucky or any other state that requires your employer to treat different employees the same way. The only caveat is that any differences in treatment cannot be based in a characteristic protected by law, which is not the case here.
They do not have to have what you consider "good cause" to fire you. They can fire you because they don't like your shoes. They can fire you because they root for the Cardinals and you're a Cubs man. They can fire you because you wore a green shirt to work.
Your employer's response to your situation clearly suggests that they, rightly or wrongly (rightly in the view of all of us here, wrongly in yours) believe you to be more at fault than the co-worker.
That means that they can fire you for what they consider inappropriate conduct. It also means that they don't have to fire your co-worker even if they fire you.
Google at-will employment.
Any other questions?
