Losing temper when you point out things they already know?

When driving for example, telling her there's a pedestrian right there be careful, she would blow up. She said "Assuming I don't have common sense is the most annoying thing to me. "

Make sure the baby has a blanket. Since she knows more about the baby, would upset her.

I didn't assume she didn't have common sense or didn't know that when cold babies need warmth. I just knew it was freezing and was reminding her

My thought is people make mistakes and burn themselves and hit ppl in their cars everyday.  Me pointing out the obvious could save an accident or prevent a mistake. She does it to me all the time and I don't take offense. She has gone off like feeling I think she's stupid, like a reminder is an attack on her or something? It's not a personal assault? Sometimes you have blind spots in the car?

Has anyone found this to be a BPD thing? Like going off on me over something so small she deems as me attacking her for gentle reminders? Noticed this was one of her triggers. But I guess over time everything I did and said became "triggering" for her to lose her temper at the very mundane