TIFU by shouting into a stranger's face at full volume

This morning I (m29) was on my way to the office. A middle-aged man came so close to me at the bottom of the escalator that he stepped on the strap of my bag that was hanging down.

Not really a reason to get too angry. Nevertheless, I told him clearly to his face to keep his distance.

Instead of apologizing, he wanted to tell me that it was my own fault because of the bag strap.

That's when I suddenly lost it.

At full volume, I shouted in his face that he should keep his distance. It wasn't a hysterical scream, but simply very loud and very piercing.

I could see his surprise, I was surprised myself.

Without saying anything else, I simply turned around again. He seemed perplexed, but quickly started shouting insults at me.

Inwardly, I wanted to apologize even at that moment! On the other hand, I was glad that he just left it at his insults.

I paid him no further attention, I was far too overwhelmed by the situation.

In the office, I just locked myself in the bathroom for a few minutes. I didn't recognize myself in the way I acted.

Maybe it was the stress of the last few months that had suddenly erupted against that man. In any case, I feel bad, because I didn’t act like the person I want to be.

To the stranger: You behaved like a total douchebag. Nevertheless, I'm sorry.

That's all.

TL;DR: Today I lost my temper so suddenly that I didn't recognize myself