something never wronger

Of course you know it's rude to talk behind someones back.
What happen to actually going up to the person and saying it.
I think it's rude in general but we are who we are.
Some people have no manners, no modesty, and it's disgusting.
I was waiting for a friend to be done and I witnessed some people.
It was too horrible to listen, and they wanted me to join.
I didn't know what to say so instead I just walked away.
Why can't it be easy, it's that simple.