The good thing about that argument: nobody who has anything to say in this world is ever going to take it seriously. Not only does it miss the point of the argument that it pretends to reply to, it also lacks common-sense and good judgement.
Well done, sir. This is why nobody takes libertarians serious.
My opinion about those?
Just ban them. Arrest their members. Don't be the socially inept libertarian nerd that thinks only in terms of theory without any real-world experience. It's perfectly fine to limit rights and freedoms in the real world. You can do it!