"Here's the wedding cake that you forced me to bake. While you enjoy it, think about the fact that, thanks to you, I've incurred substantial legal bills and had my business and very livelihood put in jeopardy. Both myself, and my family have been subjected to numerous verbal and physical threats from you, and people just like you, for no other reason than you felt the need to score a few political points at our expense.
So.........Bon Appetit!!"
Man, I'd not want to get within 1000 yards of a cake like that.
What you've suggested would be worthless for one simple reason...to be effective the person you're addressing would have to have a conscience.
Do perverts like these strike you as possessing a guilt-ridden conscience?