So this happened many years ago, but it was at a freelance site called Fiverr. I used to do some content work there and liked it for a while, but decided to leave to pursue better things and options. Anyway, I remember having a horrible experience with a buyer, who wanted me to write an ad for his company. I wrote 8 drafts, but the guy wasn't having any of it. I told him that I'd try one more time, and if nothing would work, we'd mutual cancel. So I tried another draft, and he still hated it. So I requested we do a mutual cancellation, and he wasn't having it. He kept telling me to do my job. And I told him, that we can't come to an agreement, so please, cancel. Anyway, he didn't, so I had to reach out to Fiverr. Doing so, got him really mad and he reached out to me, throwing curse words at me and just being awful. I forgot to block him after I cancelled, so he came at me. I blocked him soon after, but he said some horrible things. Anyway, you learn from the mistake, and you move on.
What was your worst experience working for a freelance site?