Eh, you ran into a few jackasses. Nothing more and nothing less. This has less to do with FFXIV's community and more to do with the anonymity of the internet in general. I've actually found FFXIV's community to be pretty friendly overall but there's always exceptions. You were honestly better off getting kicked from the dungeon with the 3 French guys anyway if the healer was just gonna jump in circles and not heal you. You're a tank so you have instant queues anyway, so they saved you the 30min penalty for leaving. As for the trial, just ignore people like that and try to learn from the death so you don't make the same mistakes next time.