I am confused about the painfulness of women's cramps.
How would you know if you're not a woman?
True, I don't have a period! Lol
I get that you're not aware of what it's like to experience those cramps. You're a guy and they're an experience that's entirely foreign to you. However, in the future I'd suggest trying to be a bit more understanding!
You can't possibly know how I feel.
You right, no one really know how another feels if they are not that person. The best you can do it be empathetic and do your best.