Cats don't always lick each other out of affection. Sometimes they're just being jerks
CBC
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https://i.cbc.ca/ais/f6bc5670-a5fc-498e-b8e5-a62b16543b3a,1784221746428/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C173%2C3984%2C2241%29%3BResize%3D%28620%29" title="View of cats at a coffee in Bogota, Colombia in 2018.
As it turns out, sometimes when a cat grooms another cat, it's trying to be annoying." width="620" />
Sometimes when a cat grooms another cat, it's nice.
A cat helping another cat out, scratching those hard-to-get spots on the back of the neck.
Other times?
It's more like, "Hey, I want that nice nap spot, and I'm going to annoy you until you get out of here."