I'll have to say that I've seen very little bashing, swearing, bullying during all of my duty finder runs.
However the first time I saw it, was during Ifrit(Hard). And surprisingly it resembled a bit like the above.

I've noticed that this kind of behaviour suddenly appears during the level 50 instances/boss fights/primal battles.
But even then, it doesn't happen that badly. I just ignore it, knowing that's the 10% of the player base who acts like that on failures.

Funny enough, I was a PLD tank who had to stun Ifrit's eruptions as well for the first time. I'm usually a very good player. But it was past midnight that day and I was feeling drowzy. Which was a bad idea to do an Ifrit run. Little to say that I stunned the plumes a lot of times by accident, due to reacting a bit too fast. People need to understand however that high pressure/ ingame latency / inexperience can lead to people stunning the plumes. The interval to stun an eruption is sometimes very short due to latency issues.

It's sometimes stressful when you stun Ifrit only to see that eruption bar almost fill itself completely before seeing the stun effect apply.
That said, for those pld tanks on stun duty. Ifrit has a fixed pattern of when he uses eruption. If you're having troubles reacting on time, learn the pattern instead.

I don't have that issue anymore though. And I can even tank and stun his eruptions at the same time.