If person A decides they don't like you, they can sue you over and over and cost you tens of thousands of dollars and never get that back. As an attorney, I’ve

If person A decides they don't like you, they can sue you over and over and cost you tens of thousands of dollars and never get that back. As an attorney, I’ve never even heard of that actually happening - other than prisoner litigation. Moreover, a judge will order someone to stop filing cases if they are bringing frivolous claims, and can hold them in contempt if they do.