Older Nurses Eating Their Young

I get really irritated when I'm in the middle of an insanely busy shift and an older nurse marches right up to me and proceeds to loudly criticize my nursing practice. Case in point – the doc orders routine bloodwork but she draws the INR and G&S. I have the requisitions filled out and ready to be sent for the ordered tests. She double checks the name on the vials with the name on the order sheets and the reqs and hands over the blood to me. I send it to the lab. 10 minutes later, I hear my name being paged just as I have finished preparing some antibiotics in the med room and rush to answer the call. The older nurse has picked up the phone and starts giving me cut eye. I ignore her and proceed to administer antibiotic when she hangs up the phone and loudly proclaims, "You know you young nurses have a lot of gall practicing in emergency. That was the lab saying that they don't have requisitions for the INR and G&S vials. Bloody young'ns so bloody unorganized I'm surprised you haven't killed anyone yet. And here's another thing – clean up yer bloody work station". Ummm... W.T.F.??? I wasn't about the let this one go (because this isn't the first time she has tried to belittle me in front of other staff) so I calmly tell her that the requisitions that needed to be sent were sent and the tests that the doc wanted are pending. The doc never asked for an INR and G&S so I don't see what difference it makes whether the lab has the requisitions or not. She proceeded to give me more stink eye before ranting on about how incompetent I am. I really hope I don't turn into a mean condescending bitch in the later years of my career. Or at least I hope I'm able to hold it in!