Docking the boat can be horrifying for some people. I can't help but watch though.
I'm also aware of the "I can do it and don't need your help" attitude some people have.
I'm that way if I don't know the person. It's not that I don't appreciate the offer, it's just that I've learned the hard way that not everyone knows what they are doing. It's easier and safer for the boat if I do it myself. I don't have to watch the other guy.
The same goes for crew on the boat. If they don't have a feel for what they are doing, I would rather they relax in the cockpit. It took a couple times of having the crew throw the line off way before we were ready to go before it occurred to me that there needs to be a little bit of knowledge before someone assists with docking.
No hard feelings if I ever turn away help!