I have 'been there' at an ALF, where many of the RA's are 'off the streets', and one of them is the LEAD person on 2nd shift!
Re: the nurse getting thrown out of the room? Being an RN, I will NOT let staff dictate to me, unless it is a supervisor, and with good reason. I hope those new nurses grow a spine, so to speak. Then again, some of those staff members have their own little cliques. Trust me, I have seen this.
Keep doing what you are doing, and give the BEST care you can give. It sounds like you are doing that already. Don't think I wouldn't notice it!