[latexr]

> Do you have any evidence for this, or is it from intuition?

I used to interact with a large number of veterinaries, including some with an explicit interest in cat behaviour. That is the consensus I recall. Though I have no doubt that this will be a spectrum and anxious cats will be more prone to disliking the bell, but the original comment suggest multiple bells in different body parts with each new one adding to the discomfort.

As for it being annoying to the humans as well, naturally that depends entirely on yourself.