Be offended when it involves you personally and give them adversarial hell. Unfortuneately, more often than not, it's some causehead bleeding out their pussified heart about something they dont like, but doesn't directly concern them. This is a variation of "for the children" that has found its use outside puritan values with political correctness mandates.
Rule of thumb: If you use purely your "empathy" to motivate you on your righteous cause you will help the world more in suicide.
And that's my controversial view.
And it's simple: "Stop finding things so fucking controversial. The western world is full of enough crocodile tears to drown Israel 6 million times over."
But now seriously, what if it DOES concern you? What giving someone an "adversarial hell" would entail specifically? Punching an offender in the face?
That's why I brought up empathy, and now will add degree of separation and method. A key question here would be, Do you feel validated by changing an opinion you don't like? Do you gain satisfaction through pushing your "better way" and why?
But to you're question as it relates to me:
If they have a face to punch, the last scene of Season 1 of Orange is the New Black covers it. If it is not a person but an occurance I was fighting, I'd feel I was wasting my time caring.