I guess to put a more statistical approach to my (end-game) dungeoneering and experiences:
Duty finder runs have been generally positive:
- Of 4 titan HM attempts: x1 Tank bailed immediatly. x1 Had an abusive player. x2 Had patient players willing to practice
- Of 7 AK runs: x3 Could not clear demon wall. x2 Had amazingly nice players. x2 Were unremarkable
- Of 3 CM runs: x1 Had an abusive player. x2 The tanks bailed before the run was complete
Pre-mades on Balmung have been very negative:
- Of 3 titan HM attempts: x2 Had abusive players who bailed. x1 Didn't even begin*
- Of 1 AK run: x1 Had an abusive player who bailed
*On that particular run, the team leader upon seeing my less-than-100% DL gear forced the team to re-form and broadcast in Mor Dhona zone chat that I was a "filthy casual expecting to be carried and to black list me", which unfortunatly a surprising number of players actually obliged their request
Conclusion:
Generally, people are more polite and friendly on the duty finder. The elitists tend to stick to pre-mades so they don't have to rub shoulders with mere mortals. However, even then the Duty Finder displays a VERY high amount of toxic behaviour (38% of runs had players who were verbally abusive, and/or bailed from the run due to the team's perceived inadequacies), which is something that needs to be addressed urgently for the health of the game. A strange trend however is that people's behaviour tends to be worse towards members of their own server, than to total strangers they are unlikely to meet again; apparently in Eorzea shitting on your own doorstep is how the cool kids do it.