I'm gonna ride up to his house and tell him to talk to me like a man tell me i need a muffler and a curfew
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OH! He did include his return address? Then I guess there's no need for the sign.
Be real careful about that, because then you're trespassing, if he wants to push the issue, and because you're on his property, law enforcement will be more likely to believe his story over yours, no matter what story he might tell. My intent was to try to publically embarass him, and perhaps find out if he's done the same to other neighbors.
At this point, it might be the wise man who decides to tread lightly.
Keep an eye on him, looking for something he does that could be "illegal", and send a letter of your own.
Roger