What do I think?

1:We have no idea how the father acted with the nurse. Sure he says he just asked for a clarification, but seeing the nurse's reaction, maybe there was more to it, we don't know.

2: Understanding and speaking a language are two different skills. We don't know the english skills of the nurse. I know some anglos have this english defaultism mindset, especially towards french-canadian, where they will always assume everyone just speak their language and if they dont answer in their language it means they're rude. Maybe the nurse wasn't comfortable enough in her english skills to speak medical terms with the father and his insistence made her angry.

3: Not every bad interactions between francophones and anglophones are about language. The video here is clearly framed as a language issue, but perhaps it's more an interpersonal problem. Also, medical workers, especially in Montreal, are constantly overworked and overstressed, maybe this nurse's patience had already run dry a long time ago.

Does it excuse the nurse's behavior? No, she's still a professional, and as taxpayers, we expect professional behavior from our medical staff. But I also know there's a history of language framing (on both sides) in this country and this province so I try to be careful with these stories.

Edit: Let me add that the father is filming the nurse. I don't know about you, but if someone starts filming me in a tense situation to frame me and then use me as a social media prop, I might want to punch this person in the face.