I don't deny that it might be possible to "trigger" someone at some point. But then again, I don't disagree that the real and more serious problem is that it was crass and distasteful. And so far as I can tell, no one was actually "triggered" by this incident - they found it crass and distasteful.
You're not correct. The statement put out by the player who was the target of the exchange shows the scene hit her VERY hard - not that it was just crass and distasteful.