There are several factors that I'm looking at here.
First of all, Eli is not an idiot. He knows exactly what he is doing. He probably obeys the rules of the road a lot more than most of us in here is. So stop calling him an idiot. (don't tell me you didnt blow most stop signs on a typical ride)
Let's analyse this a little bit more.
1) Some of you mentioned that he can get ticketed for moving slow. I'll bet if he does, then he will fight the ticket and win it in court. He is NOT in the fast left lane. He is right lane and he has a right to move slow. While he may cause a lot of inconveniences to the traffic in the right lane, but he is not causing endangerment to anyone. It is the driver's responsibility to slow down or go around the cyclist. Look on the major interstate highways with big semi trucks. Most cars are going at 80 mph while the semis are rolling at 40-50 mph max because it's either an uphill or downhill. Now, are the semis going to get ticketed because they're moving slow in the right lane? Of course not.
This is also a bully issue. Some of you are bullies and not even realize it. If this was a construction hauler or some big semi or some Bobcat crawling at this speed, then nobody would say a dam thing. They would not want to instigate anything because they know the bigger vehicle will win. But because it was a vulnerable cyclist, the bullies come out in force.
2) Statistically, almost all cyclists who get hit get hit while riding in the shoulders or bike lane or to the right side of traffic lane. While it seems some of you in here seem to be screaming for this guy to be hit so you can have your point validated, I'm afraid that Mr. Eli is more right than most of you. He is right when he said "I need to be where the drivers can see me". Eli understands this concept. Understand that most drivers' eyes are trained to identify a car profile, and they will simply see thru a cyclist. And if drivers will not see you (or rather, see thru you), then riding in the shoulder is not as safe as it appears to be. However, riding smack in the middle of a lane will catch their attention.
3) From look at the video, there are sections of road that have no shoulders! So what should Mr. Eli do in this case? Ride in the middle of the traffic lane? Or pick up his bike and walk gingerly on the right most side of the lane and pray that he won't be hit? Sorry, riding in the middle of the lane is the safest way.
4) Not sure about MA, but in CA, the laws clearly state that when there is no bike lane available, the cyclist can take up the whole lane! Yet when we do this on our Sunday ride, some drivers (luckily not a lot) still honk at us.
This tells me that these drivers are simply angry because they can't have the road all to themselves.
Honestly, a lot of the anger in here and from the drivers stem from the fact that Americans are road rage prone. I have lived in many many places on earth, from Asia to Europe, some some of the places in Asia have crazy traffic, but I can honestly say that no culture have the road rage of an American culture. When Americans get in their car, they have this sense of self-entitlement and expectations that everyone on the road should drive exactly like them, and they get into a road rage and blood boiling when they see something that they don't agree with.
In Asia, almost all drivers are conditioned to look for cyclists and mopeds (and children) zipping in and out of the road. If drivers in Asia were as road rage prone as Americans, my god, it'd be a warzone.
If Mr Eli were to get hit and killed, it would be from a raging driver who was hell bent on killing him. Mr Eli won't get hit because the driver didn't see him.
Personally, if I were Mr Eli, and knowing that this culture has a strong tendency for road rage, I would not ride that road. Too many road rage fools out there, even on RBR. I can imagine some fool out there who doesn't own a bike would not care to see the laws from Mr Eli's view. I mean even the cops don't even sympathize. That's how it is in the US: "Ride at your own risks" (Laws be damned).