3a: Some truths you have to earn the right to tell. They're being a bad spouse? Nothing useful is going to come from a random stranger pointing that out, even if they're right. That kind of truth takes a close friend, telling them in the right situation, with the right amount of firmness and the right amount of gentleness. You have to build the bridge of the relationship before you can take that kind of freight over it.

3b: You're telling the truth, but they're a snowflake, and they're melting. That is totally not on you, but once you find that out about them, you have to realize that there is nothing you can usefully do. (At least, I don't know of any way where you can get them to actually listen, rather than just blowing it off because it offends them.)

Like spending a wedding reception saying to everyone "there are people starving to death right now". Is that true? Yes. Are people upset by that knowledge? Yes. Are they, completely separately, pissed off at you for being an asshole that decided everyone should think about starving people during the wedding reception? Yes, quite reasonably.