well, when someone specifically says they don't know the username and they have no idea how to track a person down otherwise, making it sound like they don't remember any details about them at all, yes that's going to come across as weird as fuck. it's not just the username. it's acting like they couldn't remember a single stitch of detail to give on this person aside from "you deleted your plurk and i miss youuuu even though i didn't talk to you"