sorry, where are you?
did your neighbours Tom cat kill a chicken of yours?Shoot, Shovel, Shut Up.
That's what I did with my neighbor's tom cat when he didn't do anything to stop him from coming over.
I've had neighbors' dogs wander into my yard before, with chickens a mere 10 inches from them. Thankfully, those dogs are all super well trained and just want snuggles, not chickens.
his snarkiness is probably coming from embarassment again. Some people get arrogant and pig headed as a defensive reaction when they feel embarassed. I think you have a solid plan.