I recently was in the mockup stage with a client (with whom I didn't enter any contract or anything) and provided him mockups of designs. I asked for an upfront (very small just because he was first client and I had to plan for worst) but he hesitated to pay me and wanted to pay me only after providing design. He continue to be so fussy about every mockup I sent and was always demanding big big changes. So I continued to be patient listen to him and deliver him mockups. He also continued to be like öne last chance I am giving you or else you are wasting my time. And that he is a busy person.
Then one day it just went beyond my patience and I decided to quit this work. I asked him to pay at least something for over 6-8 mockups that I sent him. But he hesitated and it made me so angry that I sent him an email infuriated and told him to stop being so uncooperative, fussy and arrogant with future freelancers.
Somewhere I remember mentioning that he was stupid that he didn't appoint anyone else to talk about the project when he was so busy. Because he was never clear about what he wanted and even on asking him, he was confused or hesitating to reply.
So in reply to that email he threatened me that he will take legal action if I misbehave like this. Seriously, after all the efforts wasted and he paid me nothing, he wants to take legal action against me?
Can he really take legal action against me? And will he? On what grounds? How should I have handled this situation to prevent this?