Its the extraordinary roughness of some pilots' braking that I find annoying, particularly the full-booted stomp to release an unnecessary auto brake, perhaps followed by complete relaxation of braking with another stomp of max effort at the turnoff.
One of the boons of auto brake is its smoothness. If you need it, deploy it, leave it to do its job and pickle it gently st 60kts or less. If you don't need it (can't brake manually like some, apparently?) leave it off.
Oh, and one other thing, the people who get half way down the runway on auto brake and then bury the neighbourhood in a fistful of reverse apparently unaware that it has no effect on braking distance...and then stomp on the brakes!
Pax comfort doesn't seem to feature in some peoples' books.