sometimes you really do need to wash a cat... for medical reasons or it's covered in crude oil or something...
otherwise this is just animal torture and that person is going to get doxxed...
also not funny
(see also the documentary: "Don't Fuck with Cats")
(no, that's really the name and it started with torturing a cat in the shower)
All right I know a little bit about this so let me fact check it
Cats clean themselves so there's no need to do it yourself, they hate water and getting them stuck in a shower with water running will just make them scared af of the bathroom (and you along the way). Their tongue is sharp to help remove dust and other stuff from their fur.
Sometimes they do have things stuck like splinters where you might need to pull it out if the cat doesn't do it but that's about it.
I have never washed my cat and it's been doing great for years.