Discouraging motorists from stopping at an intersection when they have the right-of-way
This is not strictly a bicycling issue. Do-gooders who ignore the rules and want to give the right of way all the time are also irritating to other drivers. They are not necessarily safer drivers, because "scared" is not exactly the same thing as "safe". There isn't anything you can do; just take cautious advantage of the right of way and keep going. The most aggravating of the lot are those who act as enablers aggressive drivers, like those who cut in to get ahead of dozens of cars in a traffic jam.

It's not really appropriate to enter into anecdotes, but I'm compelled to give one anyway. Once (while driving, not cycling), I stopped at a stop sign in the middle of a residential neighborhood (properly, I might add; a full stop behind the painted line).  Another driver was going cross-wise, not herself facing any stop sign and thus having the right of way. This driver stopped, motioning me to proceed. I shook my head and pointed at the stop sign to indicate that I'm simply following the rules and expect everyone to do the same. She simply refused to budge, so I turned off my engine and engaged the parking brake.  I cannot remember who first yielded (or should we say, "unyielded", if you will), but I do remember that minutes passed. I remained calm and maintained an amused smile while she appeared to become angry.

Some of these do-gooders are, evidently, quite vehement about pushing their viewpoint that the rules of the road are not entirely satisfactory and should entirely be ignored in their entirety (and perhaps not even known at all) in favor of some inefficient ad-hoc social protocol.

In my experience as a driver with several hundred thousand km under my belt, you better just do what they want you to do, otherwise minutes will be wasted like in the above social experiment that I don't care to repeat. However, make eye contact with a driver before jumping in front of their car, and do not waffle; if you're given the right away, take it swiftly.