I used this on an old friend on facebook just a few hours ago and it made them disappear like fucking magic.
When a SJW or whoever goes on a rant about slavery go through their facebook pictures and find a picture of them with a product made in a slave labor country. Post the picture in that discussion and let it be known that you don't want to hear them utter another word about slavery until they rid their lives of all products owned from those countries.
If you are speaking to them face to face just ask them if they own any of these products.
If you can't find a pic just interject it into the conversation.
Warning: If you are on facebook the person will most likely delete you as a friend but they will for sure end the conversation. (My ex-friend deleted the post entirely)
I would like to give props to lezinterratial for giving me the idea
https://gfy.com/21957691-post25.html