I had a bad experience on my second duty finder run. I am new and played a tank. I didn't know how to mark monsters at the time and was trying my best to hold hate. Some guy kept yelling at me through the whole run telling me I suck. Instead of yelling at me, I wish the guy would have given me some helpful tips.

I decided I couldn't take that crap anymore and just left the dungeon. I too thought I was done with duty finder after that bad run. I learned that you just have to brush yourself off when stuff like this happens and press on. I took a break from duty finder and when I did my next run everything went so smoothly. So I suggest to just take a break from it and maybe level a craft or something, then give it another shot.