So.... if you were having lunch at your favorite restaurant and two people sitting at a table behind you were gossiping. Matter of fact they were slaughtering someone you knew what would you do?
Depends on my relationship with them and if what they're saying is true. While, yes, we shouldn't gossip at the end of the day each one of us is responsible for our own soul's salvation and walk with God.
I may just move my seat and pray for them. BTJM.