Of course, the truth of it is that the OP is being 100% unreasonable but wants to be told they are right.
So they tell their story, convinced everyone will be on their side.
When folks say YABU, they spit out their dummy then set about posting anything they can think of to try to get posters to change their minds.
tbh, when they do that, I don't believe them. I think they are making it up to get folks to agree with them.
My mil keeps coming to visit, AIBU
yes
well, she keeps talking to me and I don't like her, aibu
yes
well, you're all bitches and you're WRONG, she beats my daughter with the dog's lead
See? If the information wasn't given at first and is only given to make a YABU turn into a YANBU, then it's probably bollocks.