> but we don't find it irritating

Yes we do! My wife keeps saying "100%" and after I pointed it out she's stopped.

Also I talk to dozens of different people in my life and they all have different overused phrases. Much less tedious when there's variety.

Finally most human don't do it nearly as often as AI, and they're not quite as LinkedIn as AI.

We don't find it more annoying because it's a machine - it's simply more annoying.