Ignorant parents?

Does anyone get very annoyed when you try to have an informative conversation with someone and they always get offended and act irritated towards you?
Whenever I have a conversation with my parents and I say something informative they act like what I'm saying is a direct insult to them or something.
For example; I was talking with my mother about what we will be using to keep the baby warm as he will be born in -30 weather, she said, "just put him in a snowsuit." And I said, "it's actually dangerous to put a baby or any child into a car seat while wearing a snowsuit." I then went on to try to explain to her why it was dangerous.
She then gave me a side ways look and said, "well I put all of you in snowsuits and you're fine."
I said, "Yes, but things were different then, we have more information now and more reliable studies to go off of."
She then replied, "I don't know, I think it would be worse for the baby to freeze." 
I said, "He won't freeze, he will be wearing warm clothes, blankets and a fleece canopy overtop of the car seat,   Having something inbetween the baby and the straps or car seat just isn't safe."
I then proceeded to try and show her the car seat regulations and safety from my phone, and she just looked away and ignored me. 
This is how every conversation is with my parents when I say something informative, I always feel like because I'm younger than them they get offended when I speak intelligently, like, "how dare you tell me I'm wrong"
Is this just ignorance?!