Giving this nutjob a bit of attention on the internet is only going to enthuse him to make more outrageous lawsuits and claims. If I were one of the people he sought suit over such crazy garbage, I would come down on him with the fury of 1000 suns with my own goon squad of attorneys. Give him a taste of his own medicine. He might not have much, but what he does have, I'd take, and shut him up for good.
5,000 lawsuits, that's ridiculous. No judge should ever entertain this dingbat. He must be his own legal council too, because I would never submit a suit for this guy on my stationary, or with my endorsement from my office. Not a chance.