Learn English – A word or idiom for being offended for someone else

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Is there a word or idiom to describe being offended for some one else?

For example, Person A makes an off-the-cuff remark that person B is 'trailer trash'. Person B knows that person A means it as a joke and isn't offended. Person C then gets offended at the remark and jumps to person B's defence even though the remark had nothing to do with them. Person A and B often make these remarks to each other.

Best Answer

I would suggest vicariously offended.

Vicarious:

performed, exercised, received, or suffered in place of another

I've found a few published uses of the phrase:

Use 1:

... making their living by being vicariously offended ...

Use 2:

There's a tendency in this country for people to be vicariously offended