I am an HCA and I have had patients who ring their bells every few seconds for silly demands that they could do themselves or could wait.
I often have 18 plus patients to look after myself. The nurses are busy with paper work, medication and other important things and I'm the only one answering the bells, taking people to the toilet, turning them, checking their skin, doing the obs, the care rounds, the comforting. A lot of the time I have 6 bells going, 4 patients needing a toilet and I can't go answer the patient who is ringing constantly and asking me to do things like pass her a magazine..
So darn right it gets irritating when a patient is constantly ringing their bell and you know their request is low down on the list of importance in a busy moment.
I will go to the bell when I can and if the request is something little that can wait I will tell them it will have to wait. If they do it over and over when I've told them I'm busy and will get to them as soon as I can I'm going to get irritated, especially if they know what they are doing and treating me like a personal servant.
Telling the patient that they are sorry but they are busy right now is fine.
I am usually close by to a patient like that and can see if it is urgent. I also know if they are capable of taking themselves to the toilet, and IME the constant buzzer ringers often are (dementia excluded) if they aren't mobile and safe I'm going to answer the buzzer ASAP like I would anyone.
If others think they can do a better job come do it, work in an understaffed ward with very ill patients and see if you can do better.