You aren't obligated to feel bad for someone just because you've heard their backstory--nor did anyone ask you to.
Everybody is complaining about the backstory being brought in, but if he didn't have a backstory everyone would be complaining that he's a flat character... Explaining the past experiences of a character is important to telling a story. Please stop complaining about the author doing their job (telling the story).
You aren't obligated to feel bad for someone just because you've heard their backstory--nor did anyone ask you to.
Everybody is complaining about the backstory being brought in, but if he didn't have a backstory everyone would be complaining that he's a flat character... Explaining the past experiences of a character is important to telling a story. Please stop complaining about the author doing their job (telling the story).