You cannot be 100% sure that the ones you are saying it around arent rape victims, Holocaust survivor (or kin of), or a Jew...so you dont say it at all
But I could say this about almost literally anything. Someone who lost loved ones in a car crash or was seriously injured in one could be triggered by talking about cars, or someone who was in a combat situation could be triggered by someone mimicking gun noises, and statistically speaking those would both be rather prevalent causes of PTSD, but that doesn't mean we should stop talking about cars and ban Call of Duty. When it comes down to it we can't go around policing our speech on the off-chance that we trigger someone's PTSD. The world is a scary place and at the end of the day we have to just let it be that way with people going about their day saying things that would almost always offend the right person.
You can never understand how an amputee feels or what their challenges are unless you too have lost a limb.
True, but you can begin to for sure. Perhaps I'm just over-estimating the empathy of other people, but it seriously seems pretty easy to understand most things if you care to think about them for a bit.
That is also the same reason Dr Phil says "I will not tell you I understand" to parent's that's lost a child because he has not.
I kind of hate him honestly.