This is
 shown again when hes called steve and despite him not thinking that its his name he just says "whatever" and goes along with it, he doesn't know he's steve but he just hides the fact he thinks he isn't.
this part was fun, because it was an excuse to bring back the name ambiguity. obviously the letter should say 'dear steve' because you naturally think this guy's name is steve, because the video is called 'hi i'm steve' with him in the picture, and the first thing that happens in the video is you see the guy tell you his name is steve. so honestly even i forgot his name wasn't steve, until i said it ("dear steve") and then i instantly realized the fun built-in opportunity to reference the name ambiguity here, which sort of anchors that as a recurring theme. also gives steve a chance to mug to the camera which i thought was neat. was very careful on the facial expression here so as to not seem too mad nor too happy. just kind of shrugging it off.