The situation has gone from bad to worse. The spray bottle helped for awhile but in the long run it was a bad idea. He's now added the baring of teeth and refusing to back away to his other aggressive actions.

I've stopped putting food and water in the back yard altogether and have moved the dishes to the side yard. It's more open and within a few feet of where my neighbor puts out her food. She's had cats all of her life and I'm hoping that once she can see his behavior she can make the decision whether to have him removed or not. Having him removed will only be done as a last resort!