The best way to prove somebody incompetent is to make up stuff and then point out that it's idiotic
One way to show that somebody is incompetent is to tell them that something they're doing is stupid, even when it's not what they're doing. Take for example this comment saying that it's stupid for copy and paste to use data objects which can allow code to execute. Um, we were talking about drag and drop, not copy and paste. And in fact, the copy ...