99% of problems could be solved in FFXIV if you just join an FC. However, maybe I'm just lucky but I do pretty good in the DF. Every now and then I get some toxic guy, but most of those super tryhards are in the PF now. I did Garuda last night and after a couple fail attempts we were just like "hey I don't think it's happening, fun playing with everyone though. nice try." No one really was at each other's throats and passing blame (the funny part too, is that I enjoyed the fail run more than the over-geared tank snoozefest run).

Also keep in mind that you've probably had 50+ smooth/fine/great dungeon runs, but those leave your mind much quickly than 1 bad run does.