Here's how it's supposed to work.
I go to a restaurant with friends or family. We each look at the menu, and everyone orders something they're in the mood for and that will, in a delicious and pleasing way, satisfy their hunger.
What's not supposed to happen is for one or more people at the table to decide they should've ordered what I did, and ask me, before they've even had the first bite of their meal, "Do you mind if I have a bite of that?"
Before you ask, the answer is no.
Nothing is more annoying, rude or meal-joy sapping than having someone ask for a bite of my meal. You see that plate full of food you ordered and they brought to you? Here's a thought: eat that.
If I decide at some point to offer you a bite of my food, then that's another story. But this "Oh that looks good. Can I have a bite?" crap has got to stop.
I want to enjoy my entire meal. That includes the bite you're sacrificing your pride and self-esteem to beg for. Grow up, make up your mind, order what you want and be satisfied with it. And even if you aren't, act like you are. You can always order what I'm having next time.
Besides, if I give you one bite of my meal, what's to stop you from wanting another?
That's a rhetorical question. I'm not giving you one bite.