Personally, I think the real answer here is to just mute/mark as spam on messages that don't suit you. What may deserve some attention though, is the extent of any real damages to your business. For instance, did Quin call you out, or your business? are you being harassed on a personal contact, or your business contact? The other thing to acknowledge here is that Quin's fanbase represents an extremely small portion of your potential clients, so having them offside isn't necessarily going to cost you future business dealings. Also worth mentioning, is that anybody with any kind of industry experience is going to know better than to judge your professional abilities based upon a $1000 webpage, which is no longer hosted in its supplied form. $1000 for a webpage is a ridiculously low price, which would never be charged by any legitimate business and therefore does not serve to act as a demonstration for expectations of quality for the client.