I am another one who cannot stand a begging dog.
When I was little, my parents had a horrible, horrible west highland terrier (Duncan) that was a terrible beggar. He would nip my toes while I ate at the table to make me give him something! Looking back, I now know I was rewarding the toe nipping by giving him food, but as a scared little kid, I just wanted him to leave me alone and food was the most immediate solution!
My dearly departed spoo, Sophie, was never "allowed" to eat food from the table, but my dad would sometimes sneak her things under his armpit from his plate like a naughty little kid. So she learned to beg, but only from my dad! Grr. That drove me nuts, but it was not nearly as bad as Duncan and truly only ever with my dad, so overall it was alright.
Ari was raised in my apartment, away from my dad, so she has never begged or been rewarded for begging. When I visit my parents, she goes in her crate at meal time to prevent my dad from teaching her how.
But much like Kmart and Tiny Poodles, I have no inherent problem with Ari eating and enjoying safe human food as a treat. Ari gets tidbits in her bowl sometimes—steamed broccoli is one of her favorites—and if we go out to eat and she is being particularly lovely, in a "down" under my feet with her chin on the floor (i.e., really relaxed, and truly not thinking about my food) I will sometimes slip her a bit of a french fry or something else as a reward for being a wonderful little dog. So far, this is working, and Ari has never begged for table food!
Ari also likes to stand just outside the kitchen while I am cooking, in case I drop something. She has become really good about seeing me drop something, and then waiting until I tell her "It's all yours!" to come take it, so I never have to worry about racing her across the floor to grab a stray chocolate chip or something that I don't want her to have. I trained this by tethering her just outside the kitchen, and then eventually removing the tether.