Christians are not supposed to tolerate it. Forgiveness comes after the sin is acknowledged as sin and renounced.
What too many people are asking of Christians is that we renounce the clear line between right and wrong.
Christians should not let others force us to move the bar in the direction of sin for us to win popularity on an Internet thread or anywhere else. That is exactly how acceptance of deviancy is marching us relentlessly toward hell. Even hell itself has been watered down as if it does not exist or as if almost everyone will qualify to escape it's fire.
Jesus told the forgiven whore to "Go and sin no more."
Note his words required her to change her behavior. He did not say, "Go and keep whoring around. It's quite alright with me cause I love you no matter what you do."
Finally, someone with the correct perspective on the issue...