I wonder this. My mum was like all through my childhood and still will be snappy (or irritable or just plain rude) she is unhappy, thinks someone is bring stupid or has to wait for a second.
So, 30 years later I married a man like this. Hell I was like it in earlier relationships.
I did a little reading around why I was so unhappy in my marriage. I also observed with horror how my husband speaks to my daughter. It has made realise it not normal and it is not acceptable. I genuinely thought that was just how people in families talked to each other. I internalised it so much.
For my part I really really try not to snap at DD. And she never ever really gives me cause to be irritable. But I have real trouble dealing with DH's grumpiness.
We have had many arguments about it. I try to assert myself in a non-agressive way. It is so hard. I want to stand up for myself and dd, but know that it can lead to much worse argument.
When things are good they are really great. Lots of laughter and love in our family. But while I have managed to see and break the connection to how I was spoken to as a child, Dh is perpetuating it. I do often think about leaving but then wonder whether splitting the family in two will do worse damage. I live in a country where the child's custody is literally split in half.I don't want that.
I learnt through my job though that if you are uncomfortable then the situation is wrong for you. So, OP the fact that you posted means there is probably something wrong in your relationship.
Sorry OP. No answers on how to fix it. My own strategy has been to calmly point out that it's not acceptable or necessary to speak like that - then wait for the fall out. Also we have had big discussions about it including how we were spoken to as children and how the world has moved on from 70s parenting. Things have gotten a bit better, but it definitely goes in waves. Also I am a teacher and it means he accepts my opinion about how to talk to kids more than he may have done otherwise.
Sympathy that it happens to others.