Female Lawyers

Hey, I have a question. This guy constantly harasses me. I found out that he uses racial slurs. I have an account where I repost things that racists in my community have said. The person he messaged them too, gave me the permission to post them. I never included is full name or @. (He said Nword hard R multiple times) He's now trying to sue me based on "black mail". He says that what I did was blackmail though I've never threatened him and I didn't gain anything from posting it. He also has a bunch of people come and harass me and I have proof from a witness that he did this. I also have photo proof of him saying he'd "pay someone 50$ to beat me up". I'm still a minor and he's 18. What should I do?

||edit: it's to be noted that this guy has harassed me for over a year previous to this. He knows around where I live and he knows where I frequent. He literally slashed his exes tires this week and pushed him mom onto the ground yesterday. And his family owns guns. They even shot and killed a neighbors dog at one point.