What They Mean Is; they have searched online and found verses which clearly show that the Bible advocates slavery, polygamy and genocide.
Yes, the Bible does command Christians to kill gay people, so there's genocide, for one...
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Plenty of context:
1 Samuel 15
1 Samuel also said unto Saul, The LORD sent me to anoint thee to be king over his people, over Israel: now therefore hearken thou unto the voice of the words of the LORD.
2 Thus saith the LORD of hosts, I remember that which Amalek did to Israel, how he laid wait for him in the way, when he came up from Egypt.
3 Now go and smite Amalek, and utterly destroy all that they have, and spare them not; but slay both man and woman, infant and suckling, ox and sheep, camel and ass.
Exodus 21
1 Now these are the judgments which thou shalt set before them.
2 If thou buy an Hebrew servant, six years he shall serve: and in the seventh he shall go out free for nothing.
3 If he came in by himself, he shall go out by himself: if he were married, then his wife shall go out with him.
4 If his master have given him a wife, and she have born him sons or daughters; the wife and her children shall be her master's, and he shall go out by himself.
5 And if the servant shall plainly say, I love my master, my wife, and my children; I will not go out free:
6 Then his master shall bring him unto the judges; he shall also bring him to the door, or unto the door post; and his master shall bore his ear through with an aul; and he shall serve him for ever.