Pawprint, she sounds horrible. There's just no need to be that dickish to someone.
My story may out me to anyone who knows it.
At the time I lived in a 2-bed rented flat with my at-the-time DP (now ex) and our kitten. Ex-DP had a twin brother who was living with his girlfriend and her parents. The parents decided they could no longer deal with that, so they came to stay with us 'temporarily' until they could find a new place.
They stayed until I dumped my DP (mostly unrelated reasons, but his brother was definitely a part) and we gave back the flat. They'd break up at least once a week, and the brother regularly smoked weed in the flat. The illegality of the weed besides, they were getting the kitten stoned through second-hand smoke. Bastards.
Also over that time they invited another two male friends to stay, one of whom also moved in. That guy was actually lovely and used to do massive grocery shops, contribute to bills and clean in lieu of rent, but the other was a nightmare.
The worst night was when we had friends over (mostly mine, last time I ever invited friends over for an evening) and the nightmare friend got plastered and decided to pull his trousers down in front of a room full of guests. He wasn't wearing any pants and we were all treated to a full view of his cock for twenty minutes while we persuaded him to put his trousers back on.
I dumped the DP shortly afterwards and the kitten and I left mostly unscathed.