You're just victim blaming, trying to justify triggering someone because it's a public space, and trying to get the last word in. You're still in the wrong.

If you have PTSD, then maybe you could have a little empathy and stop doing this on purpose, which you already admitted to.

So just because they can say something back means they aren't suffering because of you?

Hey, it's not cool to target someone, especially to trigger their PTSD. Stop that.