I'm sort of impressed teenage me managed to realise she was in the wrong, too! I feel that I could easily have handled that interaction in a much worse way.

As you say, it's very easy to get defensive, and it can be hard to take a moment to step back and look at the situation as it really is. I think it might be even harder on modern social media platforms, where it can feel like there's a lot of pressure to react to things straight away before the narrative spins out of your control.

Your 'stay well clear' strategy is probably a good one! I use Tumblr a little, but I can't handle Twitter at all.