Just as I would for Protestant ministers, I would simply use the title "Reverend" to address NO "priests" (if I had anything to say to them!). Fr. Morrison of Traditio refers to them as "presbyters." Others use the term "presider." Or you can just call them "officiants" or "functionaries." Or, if you're feeling brave, "scammers!"
And I refer to "Nope" Benedict XVI as "Benny the Rat!" :roll-laugh2: A more appropriately named rodent never existed!