Again, what does this have to do with the original topic? Do you really think there would be a fuss if it were a matter of just "people talking behind people's back?"
Here's the question that you should have asked: "Do you spend hours a day scouring people's conversations for things to run back to your friends and make fun of?" And, "When you find out that other people have found out what you've been saying, are you gleeful and proud and totally without shame?"
If I had a conversation about a problem with a friend behind their back and they found out, it would be awkward, but I would apologize and then tell them to their face what I'd been saying. But if I were just making fun of them for fun's sake, which honestly, I think is horrible and if I do that, I should be ashamed and if I were found out, I should just apologize.
Stop making this about "talking behind people's back". Don't put having a conversation you are having with a problem with a neighbor in the same category as running around saying, "OOOOOOOO

did you see that picture of so and so? They look so ugly!!!!!"