I confronted him and asked him why he didn’t remove all that infected drywall inside the closet and he said that his company doesn’t deal with air conditioners and didn’t want to be liable for messing up the ductwork etc.

I have really learned (still learning) how to bring up things that I thought would be confrontational to others that aren't, and how to properly communicate with people in a business manner while also living with those people, who are also family/friends.

I have really learned (still learning) how to bring up things that I thought would be confrontational to others that aren't, and how to properly communicate with people in a business manner while also living with those people, who are also family/friends.

I have really learned (still learning) how to bring up things that I thought would be confrontational to others that aren't, and how to properly communicate with people in a business manner while also living with those people, who are also family/friends.

Also, if you are the non-confrontational type, you might consider getting a property manager who has experience having tough conversations with people.

The reason people hide behind property manager is because they fear confrontation or don't want to be the "bad guy" saying no.

And you want to be sure (as @Curtis Mears said) that the way they ask you is not confrontational and a sign of bad things to come, but respectful and explains their reason for asking as being smart and careful rather than oppositional.

Confront these feelings directly and close on the deal. 

Once they were confronted with a difficult situation, then they learned how little they knew.

Would be careful about confronting them in person - they may get physical or track where you live and harrass you or worse.Hire eviction attorney and stay in the background.