I work in an ED, and have a good relationship with registration. We do annoy each other at times. And yes, they do collect co-pays and give the option to pay now or later.
Overall, basically my goal in life is to get to the patient before registration!
That is especially true if they have never been to the hospital before. And if registration is with a patient, I will let them finish before interrupting. I will ask if registration is almost done, especially if the pt needs a stat ekg, etc (they are to be done in a timely fashion). There are a few times I have spoken up and needed to interrupt. But in most cases, if the patient is in acute distress registration will usually recognize the timing is not good.
That being said there are times the Doctor or PA is ready to see a patient, literally standing in the doorway. Most of the registrars will acknowledge the provider and mention I'm almost done, is that okay? Others make us them wait, like they are not even there. And I will say, some doctors are just rude about it, some nurses too.
And there are times, I'm having a private conversation with a patient and registration is hovering. I have asked them to give us a moment.
I understand no work situation is perfect! And I have no doubt there are some very toxic people, believe me.... Take a deep breath and be the bigger person. If someone really does offend you I would approach them privately and talk it out. And if that doesn't work, talk with your supervisor and she can speak to the unit manager and give reminders about what registration needs to do.
It sounds like you are doing some solid things to make things work better!!!