It's actually called the startle reflex.

A lack of the startle reflex can be indicative of neurological problems. So it's a pretty good feature to have.

https://en.wikipedia.org/wiki/Startle_response

However, like many reflexes, it can be over-ridden with effort.

Being ready for a response can often help negate a startle reflex.

However, I am unable to do that for these fucking canned biscuits! Although I can for other loud sounds.

I think it's because I can't perfectly predict when it will happen.

Years of trauma will not allow me to try breaking the can on the counter. Which would be a way to perfectly predict the sound. But I've been fearful of the biscuits for too long.