Check the laws in MA for lane splitting. Even here in CA where it's legal, the reaction from cagers is mixed. I've "sensed" resentment at times when I split lanes to get to the front of the line at a traffic signal. I think that might turn to hostility at a toll booth. Other times, cagers will move over to make the space on the line wider. Occasionally, a cager will move over toward the line in an attempt to prevent a bike from "getting ahead".
I believe most cagers in the US view bikes as either a curiosity or a nuisance as opposed to an equal, alternative form of vehicle that should be shown some courtesy (sp?) because of the "hardship" or whatever of riding one. My sense is that bikes are much more accepted in the UK/Europe since they are more just another form of transportation. True?