The low vacancy rates results in good tenant behavior (statistically, but there are exceptions). 

However, yes this is all part of the business, but if we allow people to do this type of behavior, then we will get more of it.

Let the broker know that you are unwilling to have any contact with the agent due to his unprofessional behavior. 

Much like the anti-student vibe I see locally it may not be about wording but re-casting the discussion around behavior and expectations.

Thomas, you can try to talk to them and introduce yourself to get to know them better and mirror their behavior.

That kind of behavior was when rates were on the way down after the recovery from the 2008 crisis.During the crisis few people could actually capitalize on the buying opportunities because lenders were not lending, home owners were foreclosed on, portfolios were collapsing like houses of cards.

Given the behavior of people in crisis, it is reasonable to expect that landlords DO NOT want criminals, especially violent criminals, to rent their units. 

Then stick to your word.There is nothing in the law that requires you to put up with this behavior.

Which I consider to be pretty typical tenant behavior.

If you're able to consistently save and invest, your behavior will predict your long term investing success more than the specific investment vehicle.