When we moved to California, we brought Skeeter with us from Texas. She was an only cat for a couple of years, and then we adopted Ozzy and Theo when a realtor friend was helping a cat hoarder sell her house. They were kittens when we got them, but she hated them from the start, as only an older sister can hate her younger brothers. We characterized it like
Shelly and Stan/Kyle from South Park. So she'd get up in "her" cat tree, all the way at the top, and hiss and swipe at them when they came near. She wouldn't let them be around her anywhere else, but she'd be up on display in our den in her little cat fort, hissing and spitting and yowling and just being a general asshole. So we decided that we'd name the cat tree "Fort Asshole." I put the sign up there and she jumped right up and gave me some stinkface over it.
I mean, who could hate these little babies?
Over time she relented, and "her" cat fort became "their" cat fort.
These days she's more comfortable with Ozzy, he's just a big love muffin- they'll even share the cat trap that keeps them off my desk. But Theo is a practitioner of the Slow Paw school of kat-fu. Like
Sylvester in Looney Tunes, chasing Spike and Chester around... he'll raise his paw in the air (like a 3 year old going 'I'm not touching you!') and just set. her. off. She hates him with all of her being.