No stealing or licking food on my plate.
Mine is the exact opposite - absolutely NO dumping food you don't want for yourself on my plate with a benevolent beam, as who should say 'Look how generous I'm being to you! Eat it all up, darling!'
My late Viennese Jewish grandfather used to do that and my parents and we kids all hated it. And now I have a MIL who does it, if you aren't
very fast and recalcitrant. I remember once DH and I went out to a restaurant with MIL and step-FIL. She ordered grilled sardines, and we had barely started on our meals she decided that she had more fish than she could eat. Did DH or I want a sardine? No thanks, we said firmly. Them she turned to step-FIL and asked him. Now, poor step-FIL was already rather Parkinsonian, and couldn't talk all that well or move very fast. So he didn't reply instantly: and, I kid you not, she waited no more than a second before picking up that sardine on her fork and trying to dump it on his plate, right in the middle of his steak. But DH and I both kind of lunged forward and prevented her putting it down, while shouting 'Oi! Wait for him to say if he wants it!'. He was able to mumble that no, he didn't, so she was foiled (though she tried several times more during the meal to persuade one of us to take it). But for heaven's sake: what a way to behave! How can anybody take it on themselves to decide that SURELY a person would just love to have a fish plonked into their steak?
So whenever we have MIL over, or eat at her house, we have to watch MIL for any preliminary moves so we can say in good time 'No, B, don't even think of parking your unwanted chips on me! Put them down!'
(Don't get me wrong: I was also brought up in a frugal post-war British household, and in a family environment I'm all in favour of people saying, when people are far enough on in their meal to know if they have spare capacity, to say 'These are yummy but I don't think I can manage them all. Would you like one?' But there's no excuse for pestering people after they have said no, and still less for shoving it on their plates without asking.)