I tried to keep it short and polite and said "im an atheist, i dont like that the bible condones slavery..." The man became offended and quite annoyed in his tone "slavery? Where does the bible condone slavery?"
At that point a good little JW wife, out of respect for the men present, would have immediately put a head covering on and quoted this scripture to you. and reminded you that there's a difference between a servant and a slave Deut 15: 16-18
But if your servant says to you, “I do not want to leave you,” because he loves you and your family and is well off with you, 17 then take an awl and push it through his earlobe into the door, and he will become your servant for life. Do the same for your female servant.
"It shall not seem hard to you when you set him free, for he has given you six years with double the service of a hired man; so the LORD your God will bless you in whatever you do.…