@Scott Trench I would stay completely out of this going forward if you can avoid it and politely tell the neighbor that you have spoken to your tenant and advised him that his behavior is inappropriate. 

The best guide to future behavior is past behavior.

The act of showing appreciation neither encourages or discourages a person to change their behavior unless the person wants to change something they are doing on their own accord. 

I agree with Ned and Chas, the tenant's have to be trained on what is appropriate behavior.

Give you the wherewithal to pursue and achieve your long-term goalsMany investors start off "too hot", and they either overdevelop their first property or they spend their money too fast - either of these behavior will stop you dead in your tracks, and you probably won't even be able to achieve your short-term goals - and you certainly won't have the resources to pursue your long-term goals.

It is next to impossible to find anyone to work here...let alone a " stable of qualified contractors"... we are in a bubble and everyone is too busy...this is why these guys get away with bad behavior

I am a radically inclusive Motivational Music Minister and am currenly employed with the YMCA as a Behavior Support Specialist, specializing in Mental Health.I was born in Oakland, CA the Summer of '83, raised in Ohio and currently reside in San Diego, CA.

My guess is that if someone has been evicted in the last 2-3 years they are pretty likely to repeat that behavior again, or at least be something to be cautious of. 

Thanks for the feedback thusfar.Just as a bit of information, between her and her husband they make about $65K per year, so it is clearly not a case of not being able to afford $600 a month.I guess I really threw up a red herring with some of this information;  what I'm really wondering if this is acceptable behavior for a tenant? 

What do the current landlord and the prior landlord say about their behavior as a tenant?