My father has Parkinson's and gets angry and augmentative easily. How can I handle this?

I had to set limits and tell my father what I would and wouldn't allow him to say to me. I didn't allow him to become abusive. I also limited the time I spent in his company.....I would leave the room if I had to. I've noticed as my father has gotten older and weaker, he doesn't have as much energy to become argumentative or combative.