I was a friend with a man who suffered TBI. I was his ONLY friend, and it was extremely difficult, especially since we lived in the same apartment building. He became quite aggressive (and even violent) at the drop of a hat. I stayed friends with him despite the behaviour for several years. Thankfully, I now live in a different state, and don't have face to face interaction daily.

I could not even imagine living with someone with TBI. You have my best thoughts and wishes. And to answer your question, NO no one has the right to act in such a way.

Take care,
Dee