I love having people in my kitchen, which is why, when I designed the house, I made the living area one large L-shaped room with the kitchen in the corner. I can watch TV or visit with the people in the living room area or dining area. There's a T-shaped island in the kitchen with my stove at one end, and a snack bar extending from it.That snack bar is where the chopping and other hand-prep goes on.
I'm always glad to have people helping me. It's part of the fun for me.
I cannot cook in a messy kitchen. Dirty dishes and other gras deux has to be cleaned up before I start. Then I'm really big about cleaning up as I go.
I simply DO NOT ALLOW people to chop on my counters or use improper utensils in my good cookware. Most of them aren't used to using $200 skillets, so I simply hand them the proper implement, and say, "Please use this."
I have a friend who comes over and cooks for us about once a week. It is so sweet of her, and the meals are always delcious, but she leaves the kitchen in an unholy mess. I hate to tell her it's more trouble to clean up after her than it would be for me to cook the meal myself.
I think my absolute worst pet peeve is when someone (usually my husband) tries to tell me how to cook something I've been making for 40 years.
I also hate it when someone asks my advice, then doesn't take it. Our son's fiancee made us a wonderful Mexican dinner last night, but said she wasn't very good at making Spanish Rice. I told her I'd be glad to either fix it, or tell her how to do it. But when she looked at my recipe, she went ahead and did it her own way, and it was, IMO, lousy. Have you ever heard of anyone putting a can of mixed vegies in their Spanish Rice?
Another thing I find extremely irritating is when someone automatically salts their food without tasting it first. I have no sympathy for them if they ruin their food.
Nibbling and tasting doesn't usually bother me, unless the person is eating something I need for a recipe. I was making my killer baked beans once, and fried up the bacon I needed for the topping. My MIL came in the kitchen and proceeded to make herself a bacon sandwich out of half of it. She said, "You don't need all that bacon." I was madder than a wet hen!
I guess the angriest I have ever gotten with a guest, though, was back when I was still canning. My ex's cousin used to help us with electrical work for no charge, and then I'd have the family (3 boys) over for dinner as a thank-you. But cousin's wife, a real biddy, didn't think home canning was safe, and wouldn't let her children eat anything she thought I had canned. I got the last laugh, though. She let them eat the new potatoes, which I HAD canned, but wouldn't let them eat the green beans, which were, in fact, frozen.
Her husband, however, ignored her preaching, ate everything, and had seconds.