This occurred yesterday while driving home from work.

Now a little back story. I’m driving in the left lane with the flow of traffic doing roughly 78 MPH. As we were passing an on-ramp, another driver (let's call them Otter) wanted to get over to the left lane as quick as possible, but without getting up to speed first. Now there was plenty of room for a car to fit between me and the car in front, but that doesn’t mean it’s okay to merge. So Otter, who just came onto the expressway puts their turn signal on and comes over into the left lane causing me to slam on my brakes and drop my speed to 60 MPH. I was almost touching their bumper. Thankfully no one was close enough behind me or else I think I would’ve been hit from behind it was so sudden. I slam on my horn but of course that does nothing. They eventually get up to speed and we continue on.

Fast forward a few miles; this is where things get tricky because our expressway splits into two different expressways. But before this happens a third lane opens up for people to merge and make sure they are in the correct lane for the split. Keep in mind, myself and Otter stayed in the left lane all the way to this point. Traffic was moving at a normal pace for the split but Otter decides a half mile from the split to put their turn signal on to get over. Clearly they want to go right; however, they make no effort to actually get over. They don’t slow down or speed up. They stay at the same speed as the car in lane next to us. I see this and move over to get behind that car and get just close enough that Otter cannot squeeze in. We make it to the split and they are stuck in the left lane. I see them throw their hands up in frustration. To make it seem like I didn’t do it on purpose I continue to the right and take the other expressway, adding a few more minutes to my commute. I think it was worth it.

Am I the asshole for forcing another driver to miss their exit?