alt Hacker NewsYes but only one of them makes most people who hear it think you don’t know the expression you’re trying to use. There’s no objective reason it has to be this way, but it is, and at least personally I appreciate being told when I’ve got something stuck to my back.
I don't really know why I should care what expression I'm trying to use (or what someone else is trying to use) as long as the intent is understood. If anything, people who are needlessly pedantic about the way I express things that they clearly understood are people I'm happy to get signal from so that I can minimize my need to interact with them going forward; it's much nicer to find out from something inane like this than to wait until we have a communication problem about something actually important.