And just to make things interesting, state the year you were born.
Born in 70.
Mine were:
Table manners.
Proper grammar.
Also born in 1970
The yard was to be kept neat and properly mowed at all times.
Don’t complain about something unless you’re willing to do the work to correct it.
I guess diet broadly defined. Eat what was on your plate. Very seldom were there desserts, no coke or other caffeinated drinks. Very limited snacks other than fruit.
Born in 1949.
To my parents, everything was a pet peeve. Both of them were misogynistic and cranky. I was born in 1948.
Another 1970!
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turn off the lights if there’s nobody in the room
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don’t ever say you hate someone. It’s OK to not like someone, but “hate is a very strong word.” (I can hear my mother saying that as I write it)
-
put your dishes in the dishwasher when you’re done eating
Mom:
Don’t talk back…not even if you do it politely because you have a question.
Dad:
Get to point first. Then add details.
Another 1970!
- Shut the door, you’re letting all the heat out.
(I can still never pass installations like thiswithout shaking my head and sighing)
Born in 1952. My parents were children of the Great Depression. Anything and everything that “wasted” money was a pet peeve. . . leaving lights on, running the A/C on anything but the hottest days of summer, color TV (our family’s first TV gave up the ghost in 1965 and my father insisted on replacing it with another black-and-white-TV. He broke down and got a color TV four years later.) We even got in a huge fight about eating my Brussels sprouts when I was in high school.
- They hated fags and weirdos. I was into music and art and the theater rather than sports, so I was considered to be both.
I was born in 1985 (did I ever mention how this board makes me feel young :D)
My mom didn’t like hearing doors slam shut and it makes me cringe a little bit when I slam one. My dad didn’t like being woken up early which probably the most understandable pet peeve ever. I was also brought up to never waste food but that’s more a value my parents had that has turned into a pet peeve of mine.
When they were growing up? Not enough to eat; my mother’s family breaking up for a while so her dad could go do itinerant labor; my father’s father dying when my father was six. Those were their pet peeves.
Oh, when I was growing up? Born in 1949. Main concerns of my parents when I was young were saving money, and not wasting food.
We had one particular bedroom door that would keep clanging, clanging and not clang or close shut, (and the air moved a lot in that part of the apartment and make the door clang repeatedly) and it would drive my mom crazy.
For my mother, opening cans. Something about it just got on her nerves, she’d always have me open all the cans for her before cooking something.
Born in 1945.
Table manners, especially chewing sounds.
Turning off lights you don’t need (this one ultimately killed my mom).
Saving money. Not investing, just putting money into the bank.
To my father, every damn thing in life was a pet peeve of his, especially everything about three of the women who married my mom’s brothers.
That’s 'cause you ARE really young. 
1937:
Don’t waste food.
Actually, looking back, I think my parents were quite tolerant.
Born 1961. My father didn’t like
Messy rooms
The drivers side back seat window open when he was driving
Children (strange for a pediatrician)
Children making noise
Slow eaters
picky eaters
Children who needed help with their fishing reels while he was trying to fish
People who he perceived as careless or stupid
On the bright side, he had a keen sense of justice and would always fight for principles.
A complicated man, and I miss him.
When I was in my room ( reading, listening to music, working on hobbies ), and by then, this was the mid-late 70s, I liked having the door shut to tune out the rest of the sounds and hubbub of the house. This drove her crazy because, based on the context, she thought my wanting the door shut was furtive/secretive/anti-social. Constant “door wars”. She was going to make me a ‘Type A’ if it killed her. She never did.
I had to eat SOME of everything being served at the dinner table. As an example, I liked spaghetti but without sauce, I just liked it with butter and grated cheese. Bit I always had to eat a small portion of sauce, usually served in a dish on the side.
But my Mom’s pet peeve as I got older was interesting, in retrospect. I was a very studious little girl, I loved to read, and I was very aware of rules and really tried to stay inside the lines, as it were. My parents were very social, they went out with friends a couple of times a week ,at least and they liked parties. They drank, sometimes too much.
Mom was scared to death that I’d become some sort of goody-goody bookworm. And it’s funny how she tried to convey to me that maybe I should break some rules or be bad every now and then. So, yes …my Moms peeve was that I always came home before curfew and didn’t sneak around with boys and smoke and drink.
Which was ironic, because I actually was sneaking around with boys and experimenting with drink and drugs. But I was good at concealment, so Mom never knew I was doing that stuff that she wanted me to do.
The midday meal was dinner, the evening meal was supper. If you referred to them as lunch and dinner respectively, Mom got upset. She still does. No idea why.