General

Good Job ! I loveee hearing about things like this, its about time people got told off for this bullshit !

But Dragorat, I don't think you have "white knight syndrome". It's usually considered a bad thing. As in, having a compulsive need to rescue others (sometimes for dubious motives): www.psychologytoday.com/blog/the-white-knight-syndrome/200905/white-knight-commonalities

What you did was confront abusive, rude and insensitive people and challenge them, with no expectation of reward or personal gratification for yourself. Bravo!