Is it normal that my roommate is defending this person?

So I was trying to get directed to the French and Francophone studies in my school, and I was sent to the operator who when I said French and Francophone studies spent about 3 -5 minutes asking me what Francophone meant and how to spell it. She did it in such a way that made me slightly frustrated because it was obvious she had no idea what the word meant and she didn't bother to just put French into the computer to look up the department, which is obvious.

However, I am only annoyed now because my room mate decided what [I] did was actually wrong. She told me, well why didn't you just say French Studies. When I told her I was simply repeating what was said she said: well the girl isn't going to know every department. When I insisted that she should have figured it out by French being the first word, she claimed her science department sometimes had a conjuction of words to described their department and if you only used one it could be the wrong department, but I insist that it is COMMON SENSE that there is not going to be multiple French departments, not to mention Francophone is not an unusual word, and with out proximity to Canada, it makes it even less unusual of a word. I knew the word BEFORE I started taking French. My room mate is a foreign speaker and already knows the word and insists that this girl who speaks English as a first language doesn't have any reason to be exposed to it.

She argued with me over this for about 15-30 minutes insisting that I was actually at fault and then saying I was making a big deal about it when in fact the only thing I was making a big deal about was the fact that she was blaming me for being annoyed with something that was obviously not my fault in the first place.

So, is it normal that my roommate is constantly defending someone she doesn't know about something so asinine that she should probably not even have bothered pointing it out.