Earlier today, I was just eating my dinner in peace. I like to eat by myself and then all of a sudden my sister comes and kind of disrupts my privacy. I kindly ask her to leave not to be rude and it's nothing personal and yes she gets mad as expected. Not that many times, she has done the same thing but if it was the other way around, she would've done the same. It's not like she cares what I have to say. She never does or show that she cares.