I certainly sympathize with being shy, as I used to be more shy, and tend to like shy people.

But consider the situation from the perspective of the person the shy person has desire for, but won't fully assert the desire for. The shy person seems interested. They're sort of approaching, but they don't make a move that you feel you could reject without seeming presumptuous. You're put in a position where either you escalate, or you live with an uncomfortable and unresolved situation.

I think that's a consistent theme across similar senses of creepiness. An unresolved discomfort with someone, perceiving a likely escalation on their part, where the removal of the discomfort at your initiative requires confrontation and potential escalation.

There's no crime to shyness, but one should be aware how your behavior affects other people.