I am aware that normal, extraverted people do stare at others. It's not so much the staring that's a stigma, but the person doing the staring. If some hot extraverted guy stares at girls, people'd think it's normal, nothing interesting. But if it's someone unattractive, unpopular who's doing the staring, he/she could receive a huge backlash. In my experience, hot/attractive/cute people get away with staring. When people see a cute kid staring at them, they go "ahhh..." When boys see a hot girl staring at them, they think it's flattering, maybe fun. But when an unpopular, unattractive person does the staring, he/she receives different reactions.