OP the community has never been perfect and always friendly.You may have perceived it that way at first but ff14 has its toxic players just as much as any other MMO.
Having said that it was probably at its most toxic point at 2.0.PF didnt exist back then and to do dungeon runs for wanderers palace people only allowed bard and blm as dps into their parties as it was the optimal set up for speed runs.
You also had most coil parties refused to let warrior in.It was basically come as pld or gtfo.
Then there was also parties shouting for tank for titan hard mode and once again most of them only allowed you to join if you were pld.Would even laugh at you when you argued that warrior was also a tank.
Not to mention Titan hardmode fight itself.Never in the games history was the community more toxic than in instances for that fight.People raging and flaming and arguing nearly every single run.Kicking people over gear or a single mistake etc.