In fact as I type this now I find it a bit offensive that was even said.  

Is there a way (legally) to prove he is smoking in-unit (other than logging the offenses)?  

Signs sound offensive to “guests”.

You nicely bug the owner, the owner starts bugging the PM, and eventually the tenant will be gone.But, I think I might go on the offense as far as calling the cops if the tenant is coming onto the property and being vocal. 

So it becomes a neighbor-to-neighbor issue, rather than a landlord to tenant issue.My County Noise Law defines a noise disturbance as any sound that is: Unpleasant, annoying, offensive, loud, or obnoxious.  

Perhaps the friendliness is not warranted and I just tell them what I need to do, but I don't want to hear more of that offensive talk towards me when I'm there.

Anyone who takes your post offensive the way he did has more problems then worrying about which tenant to choose for his property.

If your tenant refuses a rent increase and you are taking time to think it over, no offense, but you are doing it wrong.

No offense.

Going on the offensive in a professional way deflates an aggressive tenant quickly especially when the "m" word is used.