I don't think it was even personal - I didn't care who would be the Good Guys and who would be the Bad Guys. I just want there to be Good Guys and Bad Guys.

I have difficulty with this, too. I see the problem as related to correspondence bias.

In a single situation, you observe one person as being the Good Guy, and the other being the Bad Guy. This judgement gets locked into place as how they should always act. It gives you the false expectation for the same guy to be good, and the same guy to be bad. It doesn't matter who, individually, plays which role - just that they are consistently either Good or Bad, all the time.