Ive run into mostly considerate bus drivers although most of us messengers routinely give them a rough time really. I pass them using their lane all the time when they are stopped---its just wide enough usually. Ive had a few give me a rough way to go sometimes too. Most of the ones Ive actually talked to enjoy seeing us on the street, we are like circus performers or cheap entertainment, they love the trackstands and bike handling skills. I have a few try to squeeze me into a curb on occasion, but Im not sure sometimes if they even know your there, they have good mirrors but an elephant sized boxy bus has blind spots too. Locally all you need to do here is get the bus number and time and file a complaint with the bus authority, they take complaints quite seriously usually.