Bor your more than old enough for me not to require explaining the obvious to you.
Your entitled to your opinions, but this is not the place to express them. Also, the couple never asked for your thoughts.
This is something she should have been able to print out, well wishes from those they've interacted with, unspoiled by rude and demeaning comments.
Now its become something she more than likely will simply wish to ignore altogether. That was taken from her needlessly by a group of overgrown children