Oh my goodness, I thought this had to be a joke, but no. Someone actually crossed all possible boundaries, treated a single developer working on a free game like dirt and made themselves look not like a clown, but a whole circus...over a dollar. The dev treated you with more kindness than I believe you'll ever deserve. Even if the dollar meant a lot to you, I'm sure a bit of humanity and compassion wouldn't have killed you, because you'd lose nothing asking for a refund of a dollar nicely. I'd ask you to apologize, but after all the vile things that came out of your mouth, maybe your silence is for the best.
And to the dev- please hang in there. While there are individuals like this one, there's a lot of people supporting and enjoying your project. They greatly outshine the bitter minority of- no, I don't think I know of a word that would be fit to describe whatever this was in any of the languages I speak. I hope you have a wonderful day!