do you honestly think, that this “funny” post is about a cat which needed a bath because it fell into something deadly?

Why shouldn't it be? I've got a cat, if he got something nasty on himself and I had to bathe him I would absolutely be taking pictures of him looking ridiculous afterwards. "Deadly" here doesn’t need to mean that there was a big vat of cyanide sitting open or something, it could be as simple as the cat getting into a room with wet paint on the walls