Earlier quoted context omitted.
This behavior makes me a selfish driver, too. Doing 20 under what I’m doing when you hit the end of the ramp? Well, I’m sure as hell not letting you in front of me. If you can’t be bothered to do it right, I can’t be bothered, either. Which doesn’t help traffic one iota.
You are not obligated to yield to traffic entering from an onramp. You are doing it right by not letting them in front of you.
So, no, one is not obligated to yield, but at some point you’ll do it anyway if you value your passenger side door panels.