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I think it depends on the person's eye for perfection, or sometimes imperfection. Someone's own level of skill does not mean they can't be just as constructive in pointing out mistakes as someone better than you.
On your own perception, you are your own worst critic. Every artist is like that. Even if you like it when you first draw something, chances are when you go back to it, you'll find something to make you dislike it. It's absolutely normal.
I've got a Jar of Dirt! And guess what's in it!

Ah yes, that makes sense ^^
this is kind of unrelated to your post but I'm just saying this in general so yeah... It's weird how the human mind works. I mean, I'll sketch something like a random person for example and I'll have all the demensions and complicated stuff in there, and some people will be like "wtf is this D:" and other people will tell me that they think its good.. SO YEAH. it's confusing.. wow i'm rambling >_<
Well, not everyone can draw and therefore not everyone knows the various methods (ball & stick, circles and cylinders/squares, whatever) of getting the basic shape of things and so when they see it with the lines and other things besides the final bit, they get confused. I've gotten it plenty of times when I'm in public and I'm sketching. Even if it's a quick sketch of something and I can see the basic shape and they can't. It's all about you knowing what it is, not them.
I've got a Jar of Dirt! And guess what's in it!

Okay, so at least I'm not crazy ^^; Thanks for that, you seem to know what you're talking about, too.
It's only annoying when they're open about it. I've had people guess what I was sketching and they'd end up being totally wrong
gonk It makes me feel like I'm the one doing something wrong, but whatever, I can't change what they're thinking.