There is a woman at my job who is literally mean and makes everyone's lives a living hell 24/7.
Honestly it seems like the saying "misery loves company". The woman appears to be very unhappy with her life so she takes it out on everyone around her.
I don't know if I would call your "situation" mean (the Marina thread) but yeah, some people are just unhappy with their lives. You shouldn't take it personal. Let them talk, as long as your happy with yourself and your life