I would gently(the first time), remind them that we all have a part to play on the Nursing Team. I too only call them when I am desperate, as a male, I try to assist everyone with lifting and up to BSC (even other RNs/LPNs patients). Often, this effects my time management, and nothing is done in return for my patients.
So, I have a very small stomach for being ignored, or turned down for assistance. It's not like I ask them if they are running 90mph to keep up, they are generally nested somewhere when I ask. I love the ones that play hide and go seek too at the same time the Code Brown of the Week occurs.
I know there are the CNAs, PCTs, Aides, and Orderlies that I would say are invaluable to our team, but that's not the ones we are discussing here. I don't have to "prove" anything to any staff member because they have been here half a century. And, being here half a century does not entitle you to act like a complete care patient as I have seen in numerous facilities. If the assitant gives me a tude' after all I do to "Not" call them for help, they get a special reward, they get to go home early.
We are all here for the same reason, and I am not interested in making someone elses paycheck for them. If they don't like their plight in life, there's other jobs, education, or the "door."