Is AUTHOR wrong in the post ? POST : TDLR at bottom

So some context, me (white), my gf (white), and some friends (all white but one african)  were watching tv; when my gf receives a text from her dorm mate that the entire floor smelled like weed and that police were looking around. Now, earlier that very day my gf had already been ticketed for having weed on campus after someone snitched on her. So she was upset, she started ranting and then after a few moments she said "the moment i smell weed on my floor, im ratting those [n-words] out." 
The entire room just went completely silent in shock. One of my very good friends, a Nigerian, tapped my shoulder to make sure i heard it. Then he confronted her about it in a sort-of-joking way that seemed like he was just giving her a hard time. She was obviously very uncomfortable afterwards, and apologized immediately. 
Once we were alone, however, I leaned into her pretty hard about what she said and how she should be more careful about what she says and how it can be interpreted by other people. Well, she started crying and yelling saying that I am a control freak for trying to monitor her language, and that was the end of that night. The next morning she called me and was talking like nothing had happened...

TDLR : gf said n-word around my friends, I yelled at her, she cried and called me a control freak.