second-hand offense

The irritating process in which someone gets offended by something FOR someone else before they get offended, even if they wouldn't actually get offended by it. Most commonly observed on social networking platform: Twitter.

Mei: *name is Mei*
Modern Twitter users: Ur name is Mei? :/ please stop appropriating japanese names. we know ur name is amanda or basic white name
Mei: I'm literally asian help
Me: Do not fret, they are suffering second-hand offense