I don’t think you’re a bitter disappointment to your cat, s1m0n; I think he’s testing waters. Cats have a greed/gluttony streak, some more than others. Here’s something: if your cat understands “No”, then maybe we have a start.
The worst thing for a pet cat to bear is to be ignored (yeah, yeah, I know what all youse say about chilly feline independence and aloofness, but trust me on this one). There are times when my cat will put extra demands upon my attention, such as mutiple serial trips to the bathroom sink for a drinkies, or another trip outdoors that she really probably doesn’t care all that much about. Of course, I can’t be there for that all day, and besides, to indulge every whim would be a recipe for codependency and neurotic behavior on the cat’s part. Musn’t do that. What to do, then? Sometimes I just look at her and say, “No.” Usually I follow up with some explanation-as-to-why-not chatter as if she’ll understand, and of course she doesn’t necessarily understand the words, but she understands my tone, is getting attention, and gentle talk is soothing to her as long as I treat her like a “person” and not an object.
So while she doesn’t get what she wants, I’m still engaging her and she’s not being ignored. Usually she’ll go with that. Sometimes she’ll pout a bit or vocalise a parting complaint, but she also respects boundaries; after all, I’m supposed to respect hers, right? Two-way street, that. Sometimes she gets a burr under her saddle and I have to issue multiple “Nos”. But at least I’m not ignoring her, which is key.
This isn’t a magic bullet. It may take some habituation on your cat’s part to remember that your boundaries are valid, too. All you need to do is be firm, as any mother cat would do. Just don’t shut him off, either there or away in another room. Okay, well, a dangerously wacko-crazy cat that will attack strangers is another thing, but that’s not what I’m talking about here.
Just another thing about cats and getting attention: sometimes she’ll walk into the room to hang out while I’m typing away, but all behind my back, sort of; instead of sticking hardnosed to my project I make a point of acknowledging her presence in some little way, even just a “hello”, and she’s good to go. I think that little acknowledgements like that are important for the emotional health of pet cats.