I've stayed in hostel dorms with 12 other people, biggest thing was being able to have space, just to be on your own for 5 minutes. Can't really think of a particular pet peeve as such, we all got along, new people would arrive daily and everyone was friendly enough.
When I got a job I moved into a house and rented a room. I didn't interact with my other housemates, it was just awkward and whenever they were downstairs I would stay in my room. Not that they weren't nice, but just not my people.
I went fruit picking with this french lad, happened to also be called Thomas, and we ended up staying together for a few months and I would drive us to the farms, we had nowhere to stay originally so slept in my car under bridges, car parks, on streets etc until we went to stay with this lady and lived in a teepee in her garden. He drove me insane though!!! 10 minutes to make a sandwich wrapping it meticulously in cling film then tin foil on the morning we had to be out on the road at the crack of dawn. It took him ages to do anything, I wanted to strangle the fecker. He was unbelievably frugle. I had an issue with my car one day so I asked him if he would mind paying half to get it fixed but he didn't want to as it wasn't his car even though if it wasn't for my car and my driving he'd have no money anyway as I was the one driving us to farms to pick fruit!!! I lost it with him one day over some hovering that he did (we moved from the teepee into this lady's house eventually) as he wasn't doing it very well, lol. I think I was just annoyed with him overall as he was such a faff.
Then there was this Chinese guy I lived with for a bit, omg, I had to hold back my annoyance anytime he ate as he would slap his mouth ridiculously.
There's a few I can think of so far. Lol
Edit; here he is, this was the day I dropped him off at the airport.
I did miss him, I mean we spent 3 months or so together but yeah he annoyed me at times