Annoyed by little kids..😒

Does anyone else get annoyed by someone else's kid/kids? My boyfriends brother has a daughter and she's literally only 3 but she is such a brat! I know that sounds mean seeing how she's only 3 years old but c'mon on.😂 What makes it worse is that her mother doesn't like me so when her mother says something rude about me she comes back and repeats it to me. 5 minutes ago she told me that I stink.😒