If there's a presumptive pre-filled tip amount that I have to zero out that would annoy me a lot.

In most cases there is a tip button that I just don't press or I answer 'No' to the question on it. Sometimes the staff do it when handing it over. That doesn't annoy me as much and I don't usually feel much pressure since I've got a whole life behind me not tipping I guess. I do feel a bit awkward sometimes so I'd rather they not put me in the situation but I get over it.