I usually just articulate to them exactly the messed up the thing is that they are doing in a way that they have to aknowlage it. Then they have a choice, they can either say oh, I’m sorry I didn’t mean to do that and fix it. 99% of people don’t like having to aknowlage they are an asshole. They would rather you think they are stupid, not an asshole. OR, they say suck my balls and do it anyway. At that point all options are on the table.