Is this "we can't drive" day??

How about when you try to merge onto the highway, and someone is in the right lane and you watch for them to pass by while you coast on the on ramp. They keep slowing down thinking you'll pull out in front of them (like you aren't supposed to do) You wait for them to drive by, but they don't. As you start running out of on ramp, they keep slowing down in the right lane. They don't drive by, get into the left lane, or let you on, they just keep slowing down.

It's as if they are yielding for me, when I am waiting to yield onto the highway.
What's worse is when you are behind someone doing 55 and they slow down to allow a car on the highway.