These scenes always make me think about Fionas and Frank's relationship pre s1 so I'm gonna talk about it.
The way she flinches and makes herself as small as possible HURTS me.
I think its important to put that she doesn't have the same reaction when men she doesn't know shout at her. Fiona can confidently get into confrontations with strangers. This is why I link it back to Frank. Fiona isn't scared cause she being screamed at its because someone she loves and cares about is doing it.
Whenever Frank's physical abuse is brought up, people almost always go to Ian as an example as he's the one who we see it happen to most. This is fine, but I think because Ian is such a clear representation, people often don't think about the other siblings.
Frank was likely much more violent towards fiona than we see in the show. I have a few reasons for thinking this.