One thing that always baffles me is how apparently the first person to speak up when something goes wrong is automatically accepted as the only offender. Wether it was a "sorry", some funny comment or even asking someone for something specific (more mitigation, doing mechanics etc).
So, let's say a dps made a mistake, ate extra damage and maybe a nice little cleansable debuff like paralysis, a strong dot or whatever. You heal the damage they took, maybe go back to the tank for a moment, prepare for Esuna on the dps ... aand they die. Maybe because they couldn't dodge with para/ slow in time or the extra damage from the dot coincided with an aoe, so you could've prevented it but misjudged a bit.
You type a quick "sorry" and the dps that made the mistake comes back with something "it happens. just try to do better next time".
Or let's say someone eats some really spicy extra damage, maybe even in the form of a strong dot that requires more than one heal. In the end you got to pick between tank and the one who ate extra, someone dies, you write something like "oof that was messy" and you get a "np but heal more next time". Again, from the person that messed up in the first place.
I had it happen in almost every single dungeon I was in when leveling healer. Most of them ARR dungeons, so there is a good amount of active healing to do and you have less tools, which makes correcting mistakes more difficult. I still tried and and excect for one case it went well but everytime I wrote anything, even if it was just some lighthearted comment, I instantly got "np BUT...".
Like... guys... I wasn't the one messing up. I was the one trying to correct those mistakes.
It's not just a healer only thing, I have the same happening when I'm on dps. Like the tank dies from lack of mitiation/ healing/ overdoing it, everything instantly makes a beeline for me and I could've survived a couple of GCDs with Bloodbath, Second Wind, Third Eye + Merciful Eyes and Arm's Lengths, maybe long enough for everyone to get back on track but had it on CD from sometime earlier and type "should've held XY back xD".
And the response is "yeah well, at least you know better next time".
Not outright unfriendly or aggressive but it's often this pseudo-forgiving "np buuut".
Rarely do I see a "nah, I should've pulled less/ dodged it" etc.
I've seen a couple of sprouts be really harsh on themselves when this happens because they genuinly believe they were at fault and only them, when they weren't. When the only thing they did "wrong" wasn't reacting in a way that saved the pull, which isn't easy in the first place nor should it be treated as a mistake when they don't manage to do it.
A couple of sprouts were even crestfallen enough to leave the dungeon before I could intervene and make them understand that it wasn't on them. Saying something like "I shouldn't play tank/ healer, I'm just wiping us" although they were doing really well.
If I messed up, I messed up and I'll apologize. And if someone apologizes for nothing because they thought they messed up, but didn't, why not make sure they know they did nothing wrong?
Are people so happy that others didn't notice they made a mistake that they will jump at the chance of directly or indirectly blaming others, even if they did nothing wrong?