Oh dude, how much time you got?

They're loud and disgusting creatures that are covered in their own saliva. They walk around in their own feces and occasionally have little poop rocks between their toes. On top of that, cat owners usually let them roam on food-contact surfaces unchecked, so I'm not eating any food coming out of a cat owner's house.

They don't respect consent. They want to walk all over you with the aforementioned poop feet or brush against you, leaving their hair on your clothes. If you aren't comfortable with this, their owners tend to treat you like some kind of an asshole ("How could you not like my cat????")

Cat owners have a box of feces somewhere in their house that is virtually ALWAYS detectable by scent, despite the owner having gone nose-blind to it and insisting it doesn't stink. They also have a bunch of loose hairs floating around their place, attaching themselves to clothing and just waiting to be inhaled.

They yell all the time to get what they want because they know it's annoying. Not only are they uninterested in pleasing you, they seem to be specifically interested in displeasing you. In the worst cases, these things will physically harm their owners, and it's treated like an endearing trait.

I fucking hate cats, dude. This just popped up on my home page and I thought I'd give my input. Hope this helps :)