[scottmandue]

You suck at diplomacy eh?

You need:
One pair of old boxer shorts.
One wife beater shirt, preferable stained, if not spill a little coffee and ketchup on it.
One rickety old lawn chair.
One case of cheap beer and/or bottle of cheap whiskey.
One pack of lucky strikes.
One AM radio tuned into the local country western station.

Put on shirt and shorts and position chair in front yard facing offending neighbor. Chug one beer, crush it on your forehead and proceed to use it as an ashtray then begin to clean your shotgun.
If your neighbor says anything to you compliment her with "you got a purty mouth".

But seriously,
Yes your neighbor is rude, if you don't want to speak to them face to face you could at least drop a note in their mailbox asking if they are going to pay for the repair of your mailbox.