Cars are not 10 feet wide, if you move to the left side of the lane there should be room for a right turn.
If I had the time, I would ask them if they would ask a driver of a car to move over so they can make the right on red
Yes, quite often in my car I wish I had a CB so I could ask some thoughtless driver if they could use some of the gap in front of them to skooch a couple feet left so I could turn right (same for trying to get into a left turn lane). And very often if I am driving and see somebody coming up behind that can't get by me to turn right, I try to move forward and left if I can, to let them by, or think ahead and get leftward in my lane as I come to a stop to make room for anybody that might want to get by.
It's just polite. There are times to stand your ground and agitate for cyclists' rights, but
don't be a d1ck, it's bad for the rest of us.