Edit- I was born mid 80s, so very nuch a 90s childhood. I do not relate to this at all.
These are all absuive behaviours and I tried thinking about them individually. Then I thought maybe not extreme (although some definitely could have been depending on additional context)... but they didn't happen individually, and I think that makes a difference.
one occasion of parent trashing child’s bedroom
Heat of the moment reaction while having an aegument in that room or premeditated? Both abusive, but how extreme might depend on the context of how it came about.
leaving 15 year old in home for a week while parents went away (in same country)
This is the only one I can say I almost experienced. I stayed home at 15, not for a full week though, I think it was 2 nights and they checked in constantly - to the point it was annoying me. I was fine, I chose to stay behind and felt very comfortable to, but a week would have got lonely I think.
I don't think this is abusive in itself, if it were your choice. If you were left for a week having been told they didn't want you with them, without food and money and not contacted all week then yes it's abusive!
calling child self centred
Once, when you were being (and not just behaving in an age/stage typical manner), or regularly any time you tried to put your needs first?
saying child needed to be more like child’s friend
Again, regularly? And it what way?
"Why can't you study as hard as Jenny?" is not the same as constantly being told someone else is better than you.
forcing child to spend time around a pet that caused child non life threatening allergic reactio
Nobody should be putting their pet above their child. Yes this is abusive, 100%.
pulling hair and smacking
No question. Was it regular?
not allowing teen to use washing machine or cook for themselves in home
But you were allowed to stay home alone for a week and, presumably do them then. What was the reasoning? Most parents would love their teens to do these things! Sounds like a control thing so yeah.
When left home and relationship broke down in twenties, told that they were not welcome in the family home and that if they visited they were a guest
Your parents are cunts, I'm surprised you wanted to see them.