If someone appears dorky, because they are being sincere, then the fault is with the person who is judging them to be dorky. That would seem to me to be a shallow way of judging a person, as it doesn't take into account the substance of their expression, but simply that according to some arbitrary standard, they are expressing too much.
I can imagine that the standard would be predefined by a peer group, or fashion or some other fear-based construct, designed to hem in the behaviour of others by those who are themselves repressed and acting out of an agenda based on fear. jealousy and the need to control others. Hopefully the so called 'dorky' person is not influenced by this agenda and continues to express themselves freely and naturally.