I tried to debate libertarians on Facebook and they invariably respond with anti-Christian diatribes that would make the Freedom From Religion Foundation turn red. The hate for Christians was palpable.
I've never debated on Facebook. What you describe is ugly and objectionable. However, while it logically follows that those steeped in libertine depravity will be no fans of Christianity, the converse does not - that is, being anti-Christian doesn't mean you engage in libertine depravity.