Critique of Offense.
I'd be happy if the term "offended" lost what little popularity it had left. Most often, I see it used by people who are dismissive of other people being offended. And as others have rightly stated, there's nothing inherently immoral about offending someone. An oppressor being offended by the oppressed, or a grieving widower offending his wife's murderer by calling them a murder, or by testifying against them, isn't an immoral or unethical action.
So it's not offensiveness that's the issue. Insult, cruelty, and malice are the issues. Being offensive is only an issue if there's another of these modifiers present. So let's not be assholes, and let's continue to hold each other accountable when we're being assholes.
One of those ways we are assholes to each other is to tell each other to stop being so damn sensitive, and make fun of each other for being "offended". "Sensitive" is a *good* thing. It's a *strength*. A sensitive person has a quick and delicate appreciation of people's feelings. A sensitive person can more easily detect changes in what's going on around them or what's going on inside them.
Next time you say someone's being too sensitive and being offended, take an inventory of yourself and evaluate whether you should be making fun of them, or whether your actions could be better. We justify a lot of our own cruelty and callousness because we think we are excused by "toughening" others as we have "had" to "toughen" ourselves to survive. But from having learned quite a lot about fighting, both physically and otherwise... fighting skill doesn't make one as truly "tough", as courageous or brave, as being able to face someone with candor, vulnerability, honesty, and empathy. Especially if that someone is ready, willing, and able to do damage to you, physically and otherwise. That is what takes some real guts.